Hitch classes look like a simple ladder — bigger number, bigger trailer — and they mostly are. What trips people up is that the class describes the hitch alone, while the weight you can actually tow is set by whichever component in the chain is rated lowest. Very often that is not the hitch.
The classes and what they carry
- Class I — up to about 2,000 lb GTW, 200 lb tongue weight, 1¼" receiver. Bike racks, small utility trailers, a jet ski.
- Class II — up to about 3,500 lb GTW, 350 lb tongue weight, 1¼" receiver. A small boat or a single-axle utility trailer.
- Class III — up to about 8,000 lb GTW, 800 lb tongue weight, 2" receiver. The most common class on SUVs and half-ton trucks, and the point at which most people start towing campers.
- Class IV — up to about 10,000 lb GTW, 1,000 lb tongue weight, 2" receiver. Larger travel trailers and equipment trailers.
- Class V — 12,000 lb and up, 2½" receiver on most designs. Heavy equipment and large fifth-wheel-adjacent loads.
Ratings vary slightly between manufacturers, so treat the numbers above as the shape of the ladder and read the sticker on the hitch itself for the exact figures.
Gross trailer weight versus tongue weight
GTW is the total weight of the trailer plus everything in it. People weigh the empty trailer and forget the cargo, the water, the propane and the generator.
Tongue weight is the downward force the coupler puts on the ball. It should sit between 10 and 15 percent of GTW. Below 10 percent the trailer will sway; above 15 percent it lifts the tow vehicle's front wheels and takes away your steering. Tongue weight is the number that most often stops you before GTW does — a hitch rated for 8,000 lb GTW but 800 lb tongue weight cannot legally pull a 7,000 lb trailer that puts 900 lb on the ball.
The chain is only as strong as its weakest rating
Your usable capacity is the lowest of: the vehicle's tow rating from the manufacturer, the hitch rating, the ball mount rating, the hitch ball rating, and the coupler rating. It is entirely possible to bolt a Class IV hitch to a vehicle rated to tow 3,500 lb — the hitch does not raise the vehicle's rating one kilogram. Check the ball, too: a 2-inch ball is not automatically rated for the same load as the mount it is bolted to.
Weight distribution hitches
Once you are over roughly 5,000 lb, or once the trailer's tongue weight exceeds about ten percent of the tow vehicle's own weight, a weight distribution hitch stops being optional. Spring bars transfer some of the tongue load forward onto the tow vehicle's front axle and back onto the trailer axles, which restores steering and headlight aim. Many hitch ratings are published twice for exactly this reason: a lower figure for weight-carrying and a higher one for weight-distributing.
What Canadian winters do to a hitch
The receiver tube is a salt trap. Water gets in, sits at the bottom, and rusts the ball mount into the tube — the classic spring-time discovery. Fit a receiver cover when you are not towing, pull the ball mount out for storage rather than leaving it in all winter, and give the tube and the pin a wipe of grease in the autumn. A seized ball mount usually has to be cut out.
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Frequently asked questions
Can I use a 2-inch ball mount in a 2½-inch receiver?
Only with a proper reducer sleeve, and the assembly is then limited to the reducer's rating. A loose fit adds slop that hammers the receiver walls over time.
Does a bigger hitch increase my vehicle's towing capacity?
No. The vehicle manufacturer's tow rating is fixed by the frame, brakes, cooling and drivetrain. A larger hitch only removes the hitch as the limiting factor.
How do I measure tongue weight without a scale?
A dedicated tongue weight scale is the accurate answer. The common workaround is a bathroom scale with a lever arrangement, which is approximate. Many public weigh scales will do it properly for a small fee.
Do I need trailer brakes?
Requirements vary by province and by trailer weight, and most provinces require them above a threshold in the 1,360 kg (3,000 lb) region. Check your province's current regulation before towing anything substantial.