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Trailer Weight Calculator

Read the payload sticker on your truck's door jamb, then subtract the trailer's 10 to 15% tongue weight plus every passenger and cargo pound. Payload is the limit people hit first. A loaded 5,200 lb trailer puts 624 lb on the hitch, and 800 lb of family brings payload used to 1,424 lb.

Add up your trailer, cargo and tongue weight to see whether your tow vehicle can safely pull the load, and how much payload you have left.

By the Lelifi editors ·

Key takeaways

How a 2,000 lb payload gets used up624 lb800 lb576 lbTongue weight (624 lb)Vehicle cargo (800 lb)Payload left (576 lb)
On a 2,000 lb payload, a 5,200 lb trailer's tongue weight and your cargo leave 576 lb spare.
Building the numbers for a 2,000 lb payload truckTrailer dry weight 3,800 lb+ water, gear, cargo 1,400 lb= loaded trailer 5,200 lbx 12% tongue weight 624 lb+ passengers and cargo 800 lb= payload used 1,424 lbKeep total payload under the sticker on your driver's door jamb.
Every step from dry trailer weight to total payload used.
On this page
  1. The three limits that decide if you can tow it
  2. Worked example: a 5,200 lb travel trailer
  3. Why tongue weight is 10, 15% and not less
  4. Trailer weights at a glance
  5. Water, propane and the weight people forget

The three limits that decide if you can tow it

People shop for a truck by its tow rating, then get surprised on the first trip. Towing capacity is only one of three limits, and it is usually not the one you hit first.

Payload is the quiet one. A family of four plus a dog can weigh 600 lb before you load a single cooler, and a 6,000 lb trailer adds another 720 lb of tongue weight at 12%. That is 1,320 lb of payload gone before you put anything in the bed. The calculator above tracks all three at once so you can see which limit you are up against.

Every one of these numbers comes from the vehicle and trailer stickers, not from a guess. The federal National Highway Traffic Safety Administration requires the payload and GVWR figures to be printed on the driver's door jamb, and the Federal Motor Carrier Safety Administration publishes the same weight-rating definitions for commercial rigs that the sticker rules borrow from.

Worked example: a 5,200 lb travel trailer

Let's run a real setup. Your trailer's dry weight is 3,800 lb. You add 1,400 lb of water, propane, gear and food, so the loaded trailer weighs 5,200 lb. At the recommended 12% tongue weight, the hitch carries 624 lb.

If your truck's payload sticker says 2,000 lb, you have 576 lb left, enough for a bit more gear but not much. If the sticker says 1,400 lb, you are already over before you load the cooler, and you need to either lighten the trailer or move up to a bigger truck.

Now check the trailer side. If that trailer's GVWR is 5,500 lb, a 5,200 lb loaded weight leaves only 300 lb of headroom. Filling the fresh water tank at the campground on the way in, 40 gallons, or 334 lb, would put you 34 lb over the trailer's own rating. That is the kind of detail the calculator is built to catch.

Why tongue weight is 10, 15% and not less

Tongue weight is what keeps the trailer tracking behind the truck instead of wagging. Too little and the trailer becomes a pendulum: at highway speed a light tongue lets the trailer sway, and sway is what turns into the jackknife accidents you see on the shoulder of I-80.

The 10-15% window is the balance point. Take a 5,000 lb trailer. At 10% the tongue carries 500 lb; at 15% it carries 750 lb. Load your heavy gear forward of the trailer axles and you push the number up; load it behind the axles and you push it down. That is why the same trailer can tow badly one trip and fine the next, the weight distribution changed, not the trailer.

The trade-off is that a heavier tongue eats payload. A 750 lb tongue on a 1,400 lb payload leaves only 650 lb for the whole family. If you are near the edge, a weight-distributing hitch helps by moving some of that load forward onto the truck's front axle and back onto the trailer axles, but it does not reduce the total weight on the truck, it only balances it.

Trailer weights at a glance

What each number means, where it comes from, and the rule of thumb to keep in mind:

FigureWhat it isWhere to find itRule of thumb
Dry weightEmpty trailer, no water or gearTrailer spec sheetAdd 15-25% for real load
GVWRMax the loaded trailer may weighSticker on trailer frameNever exceed it
Tongue weightDownward load on the hitchWeigh at a CAT scale10-15% of loaded weight
PayloadWeight the truck can carryDriver's door jamb stickerTongue + people + cargo
Towing capacityMax trailer weightOwner's manualAssumes a near-empty truck
GCWRTruck + trailer combined maxOwner's manualRarely the binding limit

Write your own sticker numbers on a note and keep it in the glovebox. Guessing from the sales brochure is how people end up 400 lb over payload on a holiday weekend.

Water, propane and the weight people forget

The single biggest surprise for new owners is water. Fresh water weighs 8.34 lb per gallon, so a 40-gallon tank is 334 lb and a 60-gallon tank is 500 lb. That weight sits high and forward, which means it hits your tongue weight hardest. Many experienced towers travel with the tanks empty and fill up at the campground, then dump before leaving.

Propane is next. A full 20 lb tank weighs about 37 lb with the cylinder, and a two-tank setup is 74 lb. Batteries run 40-100 lb depending on size. Add a generator, a spare tire and a couple of camp chairs and you have quietly added 300 lb before the food is in. None of it is in the trailer's dry weight.

Finally, remember the hitch hardware. A weight-distributing head and shank is 50-100 lb and the spring bars another 30-60 lb, all charged to payload. If your numbers are tight, these small items are the first place to look for savings, and if they still do not fit, the honest answer is that the trailer is too big for the truck.

If you are shopping for a truck, do the math in this order: choose the trailer first, work out its loaded weight and the tongue weight that follows, then find a vehicle whose payload covers that plus your family, pets and gear. Buying the truck first and hoping the trailer fits is exactly how people end up overloaded on a mountain pass. No rating in a brochure changes the number printed on the driver's door jamb, and that sticker is the one a roadside inspector or an insurance adjuster will read.

Frequently asked questions

How much can a 2,000 lb payload truck tow?

Payload and towing capacity are different limits. A truck with a 2,000 lb payload and a 9,000 lb tow rating can pull a 7,000 lb trailer only if the tongue weight plus everything else in the truck stays under 2,000 lb. A 7,000 lb trailer at 12% tongue weight alone eats 840 lb of payload.

What should my tongue weight be?

Aim for 10% to 15% of the loaded trailer weight. On a 5,000 lb trailer that is 500 to 750 lb. Below 10% the trailer tends to sway at highway speed; above 15% you overload the hitch and rear axle.

How much does 100 gallons of water weigh?

About 834 lb, since water weighs 8.34 lb per gallon. A 40-gallon fresh tank is 334 lb, and that weight sits high, so it raises your tongue weight more than the same weight of low cargo.

How do I calculate payload used?

Add the trailer's tongue weight to everything else you put in the tow vehicle: passengers, pets, cargo, the hitch itself (often 50-100 lb), and any accessories. On a 5,200 lb trailer at 12% tongue, the trailer alone claims 624 lb of a 2,000 lb payload.

What is GVWR on a trailer?

Gross Vehicle Weight Rating is the maximum the fully loaded trailer may weigh, its own dry weight plus water, propane, gear and everything else. It is set by the manufacturer and printed on a sticker on the trailer frame.

Does the trailer's dry weight include propane and batteries?

Usually not. The dry or “dry shipping” weight is the bare trailer. Add about 40 lb for a full 20 lb propane tank and 40-100 lb for a battery bank and you have the true ready-to-camp weight before any gear.

Can I tow 6,000 lb with a 5,000 lb rating?

No. Exceeding the tow rating voids the vehicle warranty and puts you at legal risk if there is a crash. Ratings already assume a base vehicle with a driver, so your real margin is even smaller once cargo and passengers are added.

How much does a hitch setup weigh?

A weight-distributing hitch head and shank typically weighs 50 to 100 lb, and the spring bars add another 30 to 60 lb. All of it counts against payload, so include it in your total.

What is the difference between GVWR and GCWR?

GVWR caps one vehicle, the trailer or the truck by itself. GCWR is the combined rating of the tow vehicle plus trailer together. A truck might have a 7,000 lb GVWR and a 15,000 lb GCWR.

Why does my truck feel overloaded even though I am under the tow rating?

You are almost certainly over on payload. Towing capacity sells trucks, but payload is the number that runs out first, because tongue weight, passengers and cargo all draw from the same small budget.

How do I weigh my trailer at a truck stop?

Use a certified CAT scale. Weigh the truck alone, then the truck plus trailer with the trailer axles on the same pad, and subtract. For tongue weight, put only the truck and trailer's jack on the scale with the trailer unhitched.

Does a weight-distributing hitch increase my payload?

No. It shifts some tongue weight from the rear axle to the front axle and the trailer axles, which improves handling, but the total load on the truck is unchanged and still counts against payload.

What happens if I exceed my tongue weight limit?

You overload the rear axle, which lifts the front end, reduces steering grip and lengthens stopping distance. It also risks bending the hitch or cracking the receiver under load.

How much weight can a half-ton truck realistically tow?

A modern half-ton rated at 9,000-13,000 lb can comfortably pull a 6,000-8,000 lb travel trailer once you account for a family of four, gear and a 12% tongue weight. The advertised maximum usually assumes a near-empty truck.

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