Your trailer is only half the equation. What your truck and hitch are rated for is the other half.
Your trailer is half the equation
People research trailers carefully and then tow them with whatever they already own. The tow
vehicle side deserves the same attention, because it is frequently the limiting factor.
The four ratings that matter
Tow rating. The maximum trailer weight the vehicle can pull. Quoted optimistically
in marketing; check the door sticker and the manual.
Payload. What the vehicle can carry, including passengers, cargo and the
trailer’s tongue weight. This is the rating people blow through first without realising.
GCWR. Gross Combined Weight Rating: the truck and the loaded trailer together.
Rear axle rating. Especially relevant for goosenecks, where the load sits over
the axle.
The lowest of these governs. A truck advertised as towing 13,000 lb may only have 1,500 lb of
payload, which a 13,000 lb trailer’s tongue weight will consume before anyone gets in the cab.
Hitch classes
Receiver hitches are graded by capacity. The classes are a guide to what a receiver is built for,
and the ratings vary by manufacturer, so read the label on the hitch itself.
Class I and II. Light duty, small utility trailers.
Class III. The common mid-range, roughly up to 8,000 lb depending on the unit.
Class IV. Heavier work trailers, roughly up to 10,000 lb.
Class V. Heavy duty, above that.
Gooseneck and fifth wheel. Bed-mounted, for the heaviest loads.
The weakest link rule
Your setup is rated to the lowest-rated component in it. That includes the ball. A 2-inch ball
rated to 7,500 lb on a Class IV hitch gives you a 7,500 lb setup, whatever the truck can do. Check
the stamped rating on the ball, the ball mount, the receiver and the vehicle, and take the smallest.
Brakes
Most states require trailer brakes above a threshold that is commonly around 3,000 lb, though it
varies. If your trailer has electric brakes you need a brake controller in the tow vehicle. Budget
for it if the truck does not already have one, and do not treat it as optional.
Before you buy
Read your vehicle’s door sticker for payload, not the brochure for tow rating.
Subtract passengers and cargo from payload; what is left is available for tongue weight.
Work backwards to the maximum loaded trailer weight that leaves.
Check the hitch, mount and ball ratings against that figure.
Confirm you have a brake controller if the trailer needs one.
Common questions
Why is my payload rating lower than I expected?
Payload is reduced by every option on the truck and every person in it. A crew cab with four passengers has far less available payload than the brochure figure, and tongue weight comes out of what is left.
Do I need a weight distribution hitch?
Many manufacturers require one above a certain tongue weight, often around 500 lb. It redistributes load across both axles and improves steering and braking. Check your vehicle manual.
Does a bigger ball mount increase capacity?
No. The setup is rated to its lowest-rated component. Upgrading one part does not lift the rating of the others.
Know the numbers, now pick the trailer.
Every listing publishes GVWR, deck size and payload where the manufacturer publishes them.
