Trailer Dimensions and Clearance

Nominal sizes and real sizes

A "7x16" cargo trailer is not 7 ft by 16 ft inside. Trailer sizes are nominal, and the usable numbers depend on construction:

• Width. A 7 ft wide cargo trailer is typically 82 to 84 in. outside and 78 to 80 in. inside the walls, with the wheel wells intruding further on trailers where the axles sit under the box. An 8.5 ft wide trailer runs about 102 in. outside, 96 to 98 in. inside, and usually has the box above the wheels so the floor is flat wall to wall.
• Length. The nominal length is the box or deck. Add the tongue, usually 3 to 6 ft on a bumper pull, for overall length. A 20 ft deck equipment trailer is often 24 to 25 ft coupler to rear; a 24 ft enclosed car hauler is 28 ft or more. Gooseneck length is measured along the deck, and the neck adds roughly 8 ft.
• Height. Interior height on an enclosed trailer is commonly 6 ft to 6 ft 6 in., with taller options. Exterior height adds roof structure and ride height and is usually 8 to 9 ft, more on extra-height units. Measure anything you will tow under: garage doors, carports, low tree limbs at home.

We publish interior and exterior dimensions on each listing. Measure what you need to carry before you compare.

Deck height and loading angle

Deck height affects both loading and stability.

• Deck-over equipment trailers put the deck above the tires, giving a full-width flat surface of about 102 in. at roughly 32 to 36 in. deck height. Higher deck means steeper ramps and a higher center of gravity, but no fenders in the way.
• Deck-between or low-profile trailers sit the deck between the tires at around 18 to 24 in., with fenders at the sides. Easier to load, lower center of gravity, narrower usable width between fenders, usually 82 to 83 in.
• Dovetail is a downward angle built into the last few feet of the deck, with ramps folding from the end. It lowers the approach angle for low machines and cars.
• Beavertail is the equivalent on an enclosed trailer, a short sloped section at the rear that the ramp door meets, reducing the break-over angle so a low car does not scrape.

Approach angle matters most for cars, zero-turn mowers and anything with a long wheelbase and low clearance. Longer ramps and a dovetail or beavertail are the usual answers.

Doors and openings

On cargo and enclosed trailers the limiting dimension is often the door, not the box:

• Ramp doors give a full-width opening close to the interior width and double as a loading ramp. Check the ramp door's rating if you will drive a machine over it.
• Barn doors open to nearly the full width and give better clearance in tight spaces, but you need somewhere to put the swing.
• Side doors are usually 32 to 36 in. wide, with 48 in. options on car haulers.
• Door opening height is typically several inches less than interior height. A 6 ft 6 in. interior may have a 6 ft 2 in. opening.

Fitting the trailer where it will live

Measure before buying, not after:

• Driveway length and the turning path into it.
• Garage door opening height and width if you hope to store an enclosed trailer inside. Most residential doors are 7 ft tall; most enclosed trailers are taller than that.
• Gate widths on a property, including the swing.
• Municipal or HOA rules on trailer parking, which often reference overall length.
• Tongue jack clearance: a wheel or foot on the jack needs solid ground.

On the road

Wider trailers change lane position; an 8.5 ft box fills a lane and needs attention at toll plazas, drive-throughs and construction zones. Length changes turning; the trailer tracks inside the truck's path on a turn, so swing wide. Height matters under fuel-station canopies, parking garages and low bridges. Note the exterior height on a card in the truck.

Tow vehicle mirrors and hitch height

Trailers wider than the tow vehicle need extended mirrors in many states. Hitch height should put the trailer level; adjustable couplers on equipment trailers and adjustable drop hitches on the truck make this easy. A nose-down or nose-up trailer loads its axles unevenly and tows poorly.

Summary

Know the interior, exterior, deck and door dimensions; add the tongue to the nominal length; check where it will park; and verify height against anything you drive under. Then confirm the tow vehicle's own ratings on its door-jamb label and in its manual for the loaded weight you expect.

Dimensions for every unit are listed in /trailers/cargo-trailers, /trailers/enclosed-car-trailers and /trailers/equipment-trailers, or filter by size in /find-my-trailer.