GVWR, payload and tongue weight, explained

The three numbers

Almost every mistake people make buying a trailer comes from confusing three figures that sound
similar and mean very different things.

GVWR

Gross Vehicle Weight Rating is the maximum the loaded trailer is allowed to weigh, including the
trailer itself. It is set by the manufacturer, stamped on the trailer, and it is not a suggestion.
Exceeding it voids warranty, stresses axles and brakes beyond their design, and puts you on the wrong
side of the law in every state.

Empty weight

Also called dry or unloaded weight. This is what the trailer weighs before you put anything on it.
A heavier-built trailer eats into your usable capacity, which is why two trailers with the same GVWR
can carry very different loads.

Payload

GVWR minus empty weight. This is the number you actually care about, and it is the one dealers are
least likely to show you. On every Pioneer listing where the manufacturer publishes both figures, we
do the subtraction and print the result.

A 14,000 lb GVWR trailer that weighs 4,380 lb empty gives you 9,620 lb of payload.
A 14,000 lb GVWR trailer that weighs 5,500 lb empty gives you 8,500 lb. Same rating, more than half
a ton of difference.

Tongue weight

Tongue weight is how much of the loaded trailer’s weight presses down on the hitch ball. As a
working rule, aim for roughly 10 to 15 percent of the total loaded trailer weight on a conventional
bumper pull, and roughly 15 to 25 percent on a gooseneck or fifth wheel.

Too little tongue weight is the dangerous one. A trailer that is loaded tail-heavy will sway, and
sway at highway speed is how trailers end up jackknifed. Too much tongue weight is less dramatic but
it lifts the front of your tow vehicle, which costs you steering and braking.

The fix is load placement, not a bigger hitch. Put the heavy item slightly forward of the trailer
axles and secure it so it cannot migrate backwards in transit.

Where the weak link usually is

Buyers tend to size the trailer carefully and then tow it with whatever is in the driveway. Your
towing setup is only as strong as its lowest-rated component, and that is frequently the hitch, the
ball, or the receiver rather than the truck. Check all four ratings: the tow vehicle, the receiver,
the ball mount and the ball itself.

How to work it out, in order

1. Weigh or look up the heaviest thing you will haul.
2. Add everything travelling with it: attachments, fuel, ballast, tools, straps, spare parts.
3. That total is your required payload. Add a margin; loads grow over a trailer’s life.
4. Find trailers whose payload exceeds that figure.
5. Add the trailer’s empty weight back on to get the loaded weight, and check your tow vehicle and
   hitch are rated above it.