Comprehensive Guide To The Different Types Of U-Haul Trailers

Choosing the right equipment for a move depends heavily on understanding the different types of U-Haul trailers available, ranging from lightweight cargo options to heavy-duty car haulers. This guide breaks down dimensions, towing capacities, vehicle requirements, and best use cases to help you select, rent, and tow your equipment safely and efficiently.

When planning a move, sorting through logistics often comes down to matching your cargo volume and weight to an appropriate transport vehicle. U-Haul offers an array of enclosed cargo trailers and open utility trailers designed for varying hauling needs. Selecting the correct unit requires evaluating your towing vehicle's hitch capacity, understanding maximum weight limits, and knowing how load distribution affects highway safety.

Overview of U-Haul Trailer Categories

U-Haul divides its trailer inventory into two primary design classifications: enclosed cargo trailers and open trailers. Within these groups, models vary significantly by length, axle configuration, and ramp style. Recognizing these structural differences helps prevent overloaded setups and ensures compatibility with your personal vehicle or truck rental.

Enclosed cargo trailers shield belongings from weather elements, road debris, and potential theft via lockable latches. They suit household moves, retail transport, and electronics hauling. Open trailers, by contrast, feature high sides or flat deck designs without roofs. They excel at carrying bulky, irregularly shaped items, landscaping equipment, construction materials, and motor vehicles.

Enclosed Cargo Trailers

Enclosed models feature aerodynamic fiberglass or aluminum shells built over steel frames. They come in four primary lengths: 4x8, 5x8, 5x10, and 6x12 feet. Each size is engineered with specific weight tolerances and interior volume capacities.

• 4x8 Cargo Trailer: The smallest enclosed option. It offers 165 cubic feet of storage and works well for small apartment moves, college dorm relocations, or luggage transport behind mid-sized sedans and crossovers.
• 5x8 Cargo Trailer: Stepping up in width and length provides approximately 204 cubic feet of cargo space. It accommodates studio apartment furnishings or several large boxes and small furniture pieces.
• 5x10 Cargo Trailer: Providing 263 cubic feet of capacity, this single-axle unit handles larger one-bedroom apartment contents. Its added length permits long items like mattresses or lumber.
• 6x12 Cargo Trailer (Single and Tandem Axle): The largest enclosed option offers up to 392 cubic feet of space. It is designed for multi-room homes, bulky furniture, and heavy loads requiring a tandem-axle setup for highway stability.

Open Utility Trailers

Open trailers provide flexible loading configurations without height restrictions from a roof. They are frequently utilized for yard waste, furniture that exceeds enclosed dimensions, and powersports equipment.

• 4x7 Utility Trailer (Open): Features a low deck with open sides, ideal for small hauling tasks, camping gear, or yard cleanup.
• 5x8 Utility Trailer with Ramp: Combines a utility bed with a sturdy mesh loading ramp, allowing easy roll-on access for push mowers, snowblowers, or motorcycles.
• 5x10 Utility Trailer with Ramp: Offers a longer bed for extended items, featuring high side rails to secure cargo using tie-down straps.

Specialized Vehicle Transport Trailers

Moving a motor vehicle requires heavy-duty engineering, specific weight classes, and secure braking mechanisms. U-Haul provides two distinct options for vehicle transport: tow dollies and auto transports.

Tow Dollies

A tow dolly lifts the front wheels of a front-wheel-drive or rear-wheel-drive vehicle off the ground while the rear tires roll on the pavement.

• Design: Features pivoting wheel pans that swivel to make turning smoother, alongside manual wheel straps to secure the front tires.
• Limitations: Cannot be used with all vehicles. All-wheel-drive (AWD) and four-wheel-drive (4WD) vehicles generally cannot be towed on a dolly unless the driveshaft is disconnected, as continuous ground rotation of the unlifted wheels can damage the transmission.

Auto Transports (Car Haulers)

An auto transport is a full-deck, heavy-duty car trailer where all four wheels of the towed vehicle rest on the steel bed.

• Design: Equipped with built-in slide ramps, heavy-duty ratchet tire straps, and a dedicated hydraulic surge brake system.
• Capacity: Can accommodate most sedans, coupes, SUVs, and light trucks, provided the total weight of the towed vehicle does not exceed the maximum carrying capacity of the trailer and the towing vehicle's hitch rating.

Comparison of U-Haul Trailer Specifications

Reviewing precise technical dimensions, weights, and towing prerequisites ensures your tow vehicle can legally and safely handle the equipment.

Towing Vehicle Prerequisites and Hitch Requirements

Renting a U-Haul trailer requires meeting strict safety standards regarding your towing vehicle. U-Haul dealers inspect your vehicle before dispatching equipment to verify compliance with local laws and manufacturer safety margins.

Hitch Classes and Ball Sizes

Your vehicle must be equipped with a properly rated trailer hitch receiver welded or bolted directly to the vehicle frame. Bumper-mounted ball mounts are generally unacceptable unless rated by the manufacturer for trailer towing.

• Class 1 Hitches: Rated up to 2,000 pounds Gross Trailer Weight (GTW). Suitable for smaller enclosed cargo and utility trailers.
• Class 2 Hitches: Rated up to 3,500 pounds GTW. Required for tow dollies and moderately loaded single-axle trailers.
• Class 3 and Class 4 Hitches: Rated for 5,000 to 10,000+ pounds GTW. Mandatory for 6x12 enclosed trailers and full auto transports.
• Ball Size and Lighting: Most U-Haul trailers utilize either a 1-7/8-inch or 2-inch hitch ball. Your vehicle must also possess a functioning 4-way flat electrical socket to power the trailer running lights, brake lights, and turn signals.

Loading Strategy and Weight Distribution Principles

Proper weight distribution is critical to prevent dangerous trailer sway, loss of steering control, and structural failure. Incorrectly loaded cargo can lift weight off the tow vehicle's front steering tires, creating extreme driving hazards.

Step-by-Step Loading Guidelines

1. Distribute Weight Evenly: Place approximately 60% of your total cargo weight toward the front half of the trailer (near the tongue), and 40% toward the rear.
2. Secure the Load: Use heavy-duty ratchet straps or rope tied down to internal wall anchors or floor tie-downs. Shifting cargo changes the center of gravity mid-transit.
3. Check Tongue Weight: The downward force exerted on the hitch ball should equal roughly 10% to 15% of the total loaded trailer weight. Excessive tongue weight sags the rear of the tow vehicle, while negative tongue weight (heavier in back) lifts the rear and causes severe trailer sway.
4. Verify Tire Pressures: Inspect trailer tires before departure. Ensure they match cold inflation pressure guidelines printed on the sidewall.

Operational Safety and Highway Driving Tips

Towing changes vehicle dynamics significantly. Stopping distances increase, acceleration slows, and turning radiuses widen due to off-tracking where the trailer cuts corners sharper than the towing vehicle.

• Speed Management: Drive below maximum posted speed limits when towing. Maintain a safe following distance of at least one car length for every 10 feet of combined vehicle and trailer length.
• Braking Early: Apply brakes smoothly and well in advance of stops. Auto transports utilize hydraulic surge brakes that activate automatically when the tow vehicle slows down, but enclosed and utility models rely entirely on the tow vehicle's braking system.
• Backing Up Practice: Practice steering in an empty parking lot before navigating tight residential streets. Remember that turning the steering wheel to the right pushes the trailer to the left, and vice versa. Place your hand at the bottom of the steering wheel to make directional adjustments intuitive.

Frequently Asked Questions

Can I tow a U-Haul trailer with a rental truck?

Yes. U-Haul truck rentals (such as 10-foot, 15-foot, 20-foot, and 26-foot box trucks) feature heavy-duty hitch receivers capable of towing all standard U-Haul cargo and utility trailers, provided the total towing capacity is respected.

Do U-Haul trailers require an external brake controller?

Most standard U-Haul trailers—including all enclosed cargo and utility models—do not require an electronic brake controller because they utilize mechanical surge brakes or fall under weight thresholds requiring separate electric brakes. Auto transports feature self-contained hydraulic surge brake systems that engage automatically.

What is the maximum speed limit when towing a U-Haul trailer?

While legal limits vary by jurisdiction, U-Haul recommends driving at a safe, moderate speed and observing all state or provincial towing speed restrictions. Many states enforce lower maximum speed limits for vehicles towing trailers.

Can I pack fragile items inside an open utility trailer?

Packing fragile items in open utility trailers is discouraged. Open trailers expose contents to wind, rain, dust, and highway debris. Enclosed cargo trailers provide weatherproofing and secure locking doors ideal for fragile belongings.

How do I determine if my vehicle's hitch is compatible?

You can verify hitch compatibility by checking the manufacturer label stamped onto the hitch crossbar beneath your vehicle. The label specifies the maximum gross trailer weight and tongue weight limits. U-Haul rental centers also perform a physical inspection during pickup to verify hitch class, ball size, and lighting connections.

Final Recommendation

Before reserving equipment, consult your vehicle owner's manual to confirm its maximum towing capacity and hitch class ratings. Match your cargo volume to the smallest possible trailer that fits your belongings to maximize fuel efficiency and ease of handling, and always verify that your hitch, ball mount, and light wiring are securely installed before hitting the road.