Enclosed Cargo Trailer Sizes Explained: How to Choose the Right Size

Choosing the right enclosed cargo trailer size is one of the most important decisions you can make before purchasing a trailer.

A trailer that is too small can make loading difficult and limit what you can transport. A trailer that is unnecessarily large can add weight, increase towing requirements, require more storage space, and cost more.

The goal is to find a trailer that gives you enough usable space for your cargo without choosing more trailer than you actually need.

If you’re beginning your research, our Enclosed Cargo Trailer Buying Guide: How to Choose the Right Trailer for Secure Transport provides the broader buying framework. For a basic explanation of what these trailers are and how they work, see What Is an Enclosed Cargo Trailer? Complete Guide for Buyers.

This guide focuses specifically on enclosed cargo trailer sizes, dimensions, cargo requirements, payload, doors, towing, and how to choose the right configuration.

Why Enclosed Cargo Trailer Size Matters

Trailer size affects much more than how much cargo fits inside.

It can influence:

• Cargo capacity
• Maneuverability
• Towing requirements
• Interior organization
• Loading and unloading
• Parking
• Storage
• Trailer price
• Axle configuration
• Door configuration

For example, someone transporting hand tools may need a completely different trailer from a contractor transporting large equipment every day.

Similarly, a motorcycle owner may have different requirements from a business using an enclosed trailer as mobile inventory storage.

That’s why the most important question isn’t:

“What is the biggest enclosed trailer I can buy?”

Instead, ask:

“What size gives me enough usable space and capacity for the cargo I actually need to transport?”

How Enclosed Trailer Sizes Are Measured

Enclosed cargo trailers are commonly described using dimensions such as 5×8, 6×12, or 7×16.

Generally, the first number refers to the approximate width and the second number to the approximate length.

For example:

6×12 = approximately 6 feet wide × 12 feet long.

However, advertised dimensions can vary between manufacturers and configurations.

You also need to consider interior height.

A trailer might therefore be described as:

6×12×6

meaning approximately:

• 6 feet wide
• 12 feet long
• 6 feet high

But always check the manufacturer’s actual specifications.

Don’t forget the door opening

The cargo area might be large enough for your equipment while the actual door opening is too small to get the equipment inside.

Always compare:

Cargo dimensions + door opening + interior clearance.

Common Enclosed Cargo Trailer Sizes

There are many enclosed trailer configurations available.

Some commonly used sizes include:

These are general examples rather than guarantees of what a particular trailer can carry.

The appropriate size depends on:

• Cargo dimensions
• Cargo weight
• Trailer GVWR
• Payload
• Axle configuration
• Tow vehicle
• Loading requirements
• Storage space

5×8 Enclosed Cargo Trailer

A 5×8 enclosed cargo trailer is a compact option for buyers who don’t need a large cargo area.

It can be useful for:

• Hand tools
• Small equipment
• Supplies
• Boxes
• Small business inventory
• Recreational equipment

Its smaller footprint can also make it easier to maneuver and park.

A 5×8 may work well when:

• Your cargo is relatively compact
• You don’t need significant interior workspace
• You prioritize maneuverability
• Your tow vehicle has limited capacity
• You primarily transport tools or smaller equipment

However, measure your cargo carefully before choosing this size.

Equipment handles, wheels, toolboxes, and other components can require additional space.

5×10 Enclosed Cargo Trailer

A 5×10 enclosed cargo trailer provides additional length while maintaining a relatively compact width.

Those extra two feet compared with a 5×8 can make a meaningful difference when transporting longer equipment or supplies.

Potential applications include:

• Landscaping equipment
• Contractor tools
• Building supplies
• Business inventory
• Recreational equipment
• Moving boxes

A 5×10 can be useful when a 5×8 feels slightly too restrictive but a larger trailer isn’t necessary.

6×12 Enclosed Cargo Trailer

The 6×12 enclosed cargo trailer is a versatile configuration for general hauling.

The additional width and length can provide significantly more usable cargo space than smaller compact trailers.

Potential applications include:

• Contractors
• Landscapers
• Movers
• Small businesses
• Equipment transport
• Tools and inventory

A 6×12 can also provide more room for organizing cargo.

For example, you may be able to dedicate one section to equipment and another to tools or supplies.

7×14 Enclosed Cargo Trailer

A 7×14 enclosed cargo trailer provides considerably more space for buyers with larger equipment or greater storage requirements.

Potential applications include:

• Commercial equipment
• Landscaping businesses
• Contractors
• Large tool collections
• Business inventory
• Mobile workspace

The additional width can be particularly valuable when transporting wider equipment.

However, a larger trailer also needs to be evaluated in relation to:

• Tow vehicle capacity
• GVWR
• Payload
• Axles
• Brakes
• Parking
• Storage

7×16 Enclosed Cargo Trailer

A 7×16 enclosed cargo trailer provides even more floor space for buyers who need a larger transportation or working area.

It can be suitable for:

• Larger equipment
• Business inventory
• Contractors
• Mobile workshops
• Landscaping equipment
• Recreational equipment

The additional length can allow you to carry several items together rather than making multiple trips.

Before choosing a 7×16, make sure your tow vehicle and hitch system are appropriate for the trailer’s actual weight and ratings.

8.5×16 Enclosed Cargo Trailer

An 8.5×16 enclosed trailer provides a substantially wider interior than many smaller cargo trailers.

The additional width can be useful when transporting:

• Larger equipment
• Multiple motorcycles
• Business inventory
• Construction equipment
• Large tools
• Specialized cargo

Because of its larger dimensions, buyers should pay particular attention to:

• GVWR
• Empty trailer weight
• Payload
• Axle configuration
• Brakes
• Tow vehicle capacity

A larger trailer should always be selected based on the complete towing combination.

8.5×20 Enclosed Cargo Trailer

An 8.5×20 enclosed cargo trailer is intended for buyers who need substantial enclosed cargo space.

The larger interior can support applications involving:

• Large equipment
• Extensive inventory
• Commercial hauling
• Multiple recreational vehicles where dimensions permit
• Mobile workshops
• Large tool collections

The increased size can also require more careful planning for:

• Towing
• Parking
• Storage
• Turning
• Loading
• Weight distribution

Don’t select an 8.5×20 simply because it provides more room. Make sure the additional capacity actually serves a purpose for your work or cargo.

Choosing Trailer Length

Length is one of the first measurements you should determine.

Start by measuring the longest item you intend to transport.

Then consider the space required for:

• Loading
• Doors
• Tie-downs
• Equipment handles
• Toolboxes
• Walkways
• Additional cargo

For example, if your equipment is 10 feet long, choosing a 10-foot trailer may leave very little practical room.

A slightly longer trailer could make loading and organization easier.

Don’t measure only the cargo itself.

Think about the entire loading arrangement.

Choosing Trailer Width

Width is equally important.

Measure the widest piece of equipment you intend to transport.

Then consider:

• Door opening width
• Interior wall clearance
• Wheel wells
• Tie-down placement
• Equipment movement
• Loading ramps

An item may technically fit inside a trailer but be difficult to load if there is almost no clearance on either side.

Door width matters too.

Always compare:

Interior width + door opening width + cargo width.

Choosing Interior Height

Height is often overlooked.

If you’re transporting:

• Tall equipment
• Shelving
• Motorcycles
• Machinery
• Large tools
• Commercial inventory

you need to know the actual interior height.

Also check the height of the door opening, not just the height of the interior.

A trailer might have a tall interior but a lower rear door opening.

Think about loaded height

If your equipment is transported with attachments, handles, racks, or other components installed, measure it in the exact configuration in which it will enter the trailer.

Cargo Weight vs. Trailer Size

A larger trailer does not automatically mean greater payload.

This is extremely important.

Trailer dimensions tell you how much physical space you have.

GVWR, axle ratings, tire ratings, and empty trailer weight help determine how much weight the trailer can carry within its applicable ratings.

For example, a hypothetical trailer might have:

• GVWR: 7,000 lbs
• Empty weight: 2,800 lbs

That would leave approximately:

7,000 − 2,800 = 4,200 lbs

of theoretical remaining capacity.

However, always use the actual manufacturer’s specifications for the specific trailer.

Space and weight are separate considerations.

You need enough of both.

For a broader explanation of enclosed trailers and their weight considerations, see What Is an Enclosed Cargo Trailer? Complete Guide for Buyers.

Single Axle vs. Tandem Axle

Trailer size often corresponds with axle configuration, but there is no universal rule that every trailer of a particular size must use a specific axle arrangement.

Single axle

Often associated with smaller and lighter trailer configurations.

Potential benefits include:

• Simpler configuration
• Lower empty weight
• Easier maneuverability

Tandem axle

Common on larger and heavier enclosed trailers.

Potential benefits can include:

• Greater load-support capability depending on ratings
• Greater support for larger trailer bodies
• Better suitability for many heavier applications

Always evaluate the actual axle and trailer ratings rather than assuming capacity based solely on axle count.

Door Size and Loading Space

The trailer’s doors can determine whether your cargo can actually enter the trailer.

Common door configurations include:

• Ramp door
• Barn doors
• Rear double doors
• Side door
• Combination configurations

Ramp doors

A ramp door can be particularly useful for:

• Motorcycles
• Wheeled equipment
• Carts
• Lawn equipment
• Small machinery

Barn doors

Barn-style doors can provide convenient access for boxes, tools, and other cargo.

Side doors

Side access can be useful when you frequently need to reach equipment without opening the rear of the trailer.

The best configuration depends on your application.

Matching Trailer Size to Your Application

Your intended use should influence the size you choose.

These are general examples, not fixed recommendations.

The actual size you need depends on the dimensions and weight of your cargo.

How Much Extra Space Should You Leave?

One of the biggest mistakes buyers make is choosing a trailer that fits their cargo exactly.

If your cargo takes up almost every inch of the trailer, loading and unloading can become difficult.

Extra space can be useful for:

• Tie-downs
• Cargo movement
• Tool storage
• Additional supplies
• Future equipment
• Walkways
• Loading clearance

However, excessive unused space isn’t necessarily beneficial.

A larger trailer can increase:

• Trailer weight
• Cost
• Towing requirements
• Storage requirements
• Maneuvering difficulty

The goal is usable space, not maximum space.

Trailer Size and Your Tow Vehicle

Before purchasing a larger enclosed trailer, check your tow vehicle.

Consider:

• Maximum tow rating
• Vehicle payload capacity
• Hitch rating
• Tongue-weight capacity
• Trailer GVWR
• Trailer empty weight
• Expected cargo weight

An empty trailer might be relatively light, but once loaded with equipment, its operating weight can increase significantly.

Your towing setup needs to account for the actual loaded trailer, not just the empty trailer.

If you are comparing different trailer types because of towing requirements, our Utility Trailers category provides open trailer configurations that may suit certain lighter or easier-access hauling applications.

Trailer Size and Storage

Don’t forget where you’ll keep the trailer.

A larger enclosed trailer requires more space for:

• Parking
• Turning
• Backing
• Storage
• Door clearance

Before buying, measure your storage location.

Check:

• Driveway width
• Gate width
• Parking length
• Overhead clearance
• Turning space

A trailer that fits your cargo but cannot comfortably fit your storage area may create unnecessary problems.

When Should You Choose a Larger Enclosed Trailer?

A larger trailer may make sense if:

• Your equipment is growing
• You regularly transport multiple items
• You need interior workspace
• You need additional inventory space
• Your current trailer is consistently full
• You anticipate expanding your business

But don’t buy significantly more trailer than your tow vehicle and actual needs justify.

For buyers transporting wide or heavy equipment that doesn’t need to be enclosed, Deck-Over Trailers can provide a different configuration with an open deck.

When Should You Choose a Smaller Enclosed Trailer?

A smaller trailer may make sense when:

• You transport lightweight cargo
• You need easy maneuverability
• Storage space is limited
• Your tow vehicle has limited capacity
• You rarely transport large equipment
• You want a more compact setup

For many buyers, the smallest trailer that comfortably accommodates their actual cargo can be a practical solution.

Enclosed Cargo Trailer Size Comparison

These sizes should be treated as general categories rather than guarantees of a particular trailer’s capacity.

Enclosed Cargo Trailer Size Buying Checklist

Before choosing a size, answer these questions.

Cargo

☐ What will I transport?
☐ What is the longest item?
☐ What is the widest item?
☐ What is the tallest item?
☐ How much does the cargo weigh?

Trailer

☐ What interior length do I need?
☐ What interior width do I need?
☐ What interior height do I need?
☐ What door opening do I need?
☐ Do I need a ramp?
☐ Do I need a side door?

Weight

☐ What is the trailer’s GVWR?
☐ What is the empty trailer weight?
☐ What is the available payload?
☐ What are the axle ratings?
☐ What are the tire ratings?

Towing

☐ Can my vehicle tow the loaded trailer?
☐ Is my hitch properly rated?
☐ Is tongue weight within limits?

Storage

☐ Where will I park the trailer?
☐ Is there enough turning space?
☐ Is the entrance wide enough?
☐ Is there enough overhead clearance?

Frequently Asked Questions

What is the most common enclosed cargo trailer size?

There isn’t one universal size that works for every buyer. Smaller configurations such as 5×8 and 5×10 are useful for compact cargo, while 6×12, 7×14, and 7×16 provide more room for equipment and commercial applications.

Is a 5×8 enclosed trailer big enough?

A 5×8 can be sufficient for tools, supplies, small equipment, and other compact cargo. Measure your actual cargo before deciding.

Is a 6×12 enclosed trailer a good size?

A 6×12 provides a useful balance between interior space and trailer size for many general-purpose applications, but the right size depends on your cargo and towing setup.

Is a 7×16 enclosed trailer good for business use?

It can provide substantial interior space for tools, equipment, inventory, and mobile-work applications. Its suitability depends on the cargo, payload requirements, and tow vehicle.

Is a bigger enclosed trailer always better?

No. A larger trailer provides more space but can also increase weight, cost, towing requirements, storage requirements, and maneuvering difficulty.

How much extra room should I leave inside an enclosed trailer?

Leave enough room for loading, unloading, tie-downs, doors, equipment movement, and any additional cargo you expect to carry. Avoid selecting a trailer that only fits the cargo with virtually no clearance.

Does trailer size determine payload?

No. Physical dimensions and payload are different considerations. Always check GVWR, empty trailer weight, axle ratings, tire ratings, and manufacturer specifications.

Can an enclosed cargo trailer replace a horse or stock trailer?

A standard enclosed cargo trailer is designed for general cargo, not animal transportation. If you need to transport horses or livestock, explore Horse Trailers & Stock Trailers, which are purpose-built for those applications.