Towing Capacity, Tongue Weight & Setup
How Much Can My Truck Tow?
Not the number in the advert. The number is the smallest of four limits, and three of them are on labels you already have.
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Short answer
Your real limit is the smallest of: the tow rating for your exact configuration, GCWR, your remaining payload after people and gear, and your receiver's rating. On most light trucks the payload figure binds first.
The four limits, and where each lives
| Limit | Where | What it means |
|---|---|---|
| Tow rating | Owner's manual or the maker's towing guide for your configuration | Maximum trailer weight the powertrain and brakes are rated for |
| GCWR | Owner's manual | Maximum combined weight of loaded vehicle plus loaded trailer |
| Payload | Tire and loading placard inside the driver's door | Combined weight of occupants and cargo, including tongue weight |
| Receiver rating | Label on the receiver itself | Gross trailer weight and tongue weight the hitch is rated for |
Working it out
Ten minutes, with a notebook
Write down your payload
From the placard. This is the figure most likely to bind, so start here.
Subtract everyone and everything
Passengers at real weights, bed and cabin cargo, permanent accessories, and the hitch hardware's own weight.
What remains is your tongue weight budget
Call it T.
Divide by 0.13
At a mid-range 13 percent tongue weight, T divided by 0.13 is the heaviest loaded trailer your payload supports.
Compare against the other three limits
Tow rating, GCWR and the receiver's rating. Take the smallest of all four.
Compare against the trailer's real weight
Loaded, not the brochure dry weight - which routinely understates by a four-figure margin.
Quick picks
Tap any row to jump to the full write-up. How these are chosen - and what we do and do not claim to know - is published in full on our research methodology page.
| # | Product | Best for | Our read | Price |
|---|---|---|---|---|
| 1 |  Sherline Trailer Tongue Weight Scale The missing measurement | Measuring tongue weight at home | Turns the arithmetic into a real number | Check price on Amazon #ad Affiliate link - we publish no price; Amazon shows the current one |
| 2 |  Weigh Safe Adjustable Drop Hitch with Built-in Tongue Weight Scale Measures continuously | Owners who will never visit a scale | Gauge in the shank | Check price on Amazon #ad Affiliate link - we publish no price; Amazon shows the current one |
| 3 |  CURT Round Bar Weight Distribution Hitch with Sway Control (14K) When tongue weight is the issue | Mid-size travel trailers | Redistributes, does not raise ratings | Check price on Amazon #ad Affiliate link - we publish no price; Amazon shows the current one |
1. The missing measurement
Sherline Trailer Tongue Weight Scale
Sherline · Best for measuring tongue weight at home
A dedicated scale you sit under the coupler to read tongue weight directly, with no arithmetic and no trip to a weighbridge. It is the one tool on this site that turns the single most important towing number from a guess into a measurement.
We have not sourced a full specification table for this model from the manufacturer’s own site at a stable address. Rather than repeat figures we cannot cite, the assessment above is limited to what the design and the maker’s published description genuinely establish.
What works
- Direct reading, with no bathroom-scale-and-lever arithmetic
- Repeatable, so you can see what moving the load actually does
- Mechanical gauge with no batteries to be flat when you need it
What does not
- Must be used on level ground with the coupler at towing height
- Single-purpose tool that spends most of its life in a cupboard
Skip it if
Unnecessary if your hitch already has a built-in gauge, or if you have a public scale nearby and are happy to use it.
#ad Affiliate link - we publish no price; Amazon shows the current one
Raw specifications: Sherline’s own page. We earn nothing on that link.
2. Measures continuously
Weigh Safe Adjustable Drop Hitch with Built-in Tongue Weight Scale
Weigh Safe · Best for owners who will never visit a scale
An adjustable drop hitch with a hydraulic gauge in the shank, so the tongue weight reads out as you lower the trailer onto the ball. It turns the single most-skipped step in towing into something that happens automatically, which is worth more than the hardware itself.
We have not sourced a full specification table for this model from the manufacturer’s own site at a stable address. Rather than repeat figures we cannot cite, the assessment above is limited to what the design and the maker’s published description genuinely establish.
What works
- Reads tongue weight every time you hitch, with no extra step
- Adjustable height and reversible for rise as well as drop
- Makes the 10-15 percent rule checkable instead of theoretical
What does not
- The gauge reads at the ball, so it is sensitive to being parked on a slope
- Heavier and considerably more expensive than a plain mount
Skip it if
Not needed if you already weigh at a public scale - the gauge is convenience, and a certified scale is still the more accurate number.
#ad Affiliate link - we publish no price; Amazon shows the current one
Raw specifications: Weigh Safe’s own page. We earn nothing on that link.
3. When tongue weight is the issue
CURT Round Bar Weight Distribution Hitch with Sway Control (14K)
CURT · Best for mid-size travel trailers
A conventional round-bar system with integrated lubrication and sway control, rated to 14,000 lb gross and 1,400 lb tongue. The built-in lubrication matters more than it sounds: a dry weight distribution head is the usual source of the groaning people mistake for a failing hitch.
Published specifications
What works
- Integrated lubrication at the head, which is where the noise usually comes from
- Round bars sit lower and clear more trailer tongues than trunnion bars
- Limited lifetime warranty
What does not
- Round bars hang lower than trunnion bars and are the first thing to catch on a steep driveway
- Sway control here is a function of the head, not an adjustable four-point system
Skip it if
Skip it if you regularly cross steep transitions - a round bar is the lowest part of the whole rig and will find the pavement before anything else does.
#ad Affiliate link - we publish no price; Amazon shows the current one
Raw specifications: CURT’s own page. We earn nothing on that link.
What SAE J2807 actually tells you
Most manufacturers now publish tow ratings established under SAE J2807, a defined test procedure covering acceleration, gradeability, cooling and handling. It makes published figures comparable between manufacturers, which they historically were not. What it does not do is account for your passengers, your gear or how your particular trailer is loaded - which is why the arithmetic above still matters.
Key takeaways
- Four limits apply simultaneously and the smallest one governs.
- Payload is on the door placard and usually binds first on light trucks.
- Tow rating is configuration-specific and lives in the manual, not on a sticker.
- Compare against the trailer's loaded weight, never its dry weight.
How we sourced this
Every figure on this page came from one of the following, each fetched while the page was written. Where a manufacturer or regulator does not publish a number, we say so rather than estimate it.
- SAE J2807 - Performance Requirements for Determining Tow-Vehicle Gross Combination Weight Rating and Trailer Weight Rating
- 49 CFR 571.110 (FMVSS 110) - vehicle placard, including the required "combined weight of occupants and cargo" statement
- 49 CFR 567.4 - certification label content, including Gross Vehicle Weight Rating and Gross Axle Weight Rating
Common questions
- Is towing capacity on the door jamb?
- No. The door jamb carries GVWR, GAWR and the payload placard. Tow rating and GCWR are in the owner's manual or the manufacturer's towing guide for your configuration.
- Can I tow at 100 percent of my rating?
- The rating is a maximum under defined conditions, not a target. Heat, altitude, grade and a long trip all make life at the limit harder. Most people are more comfortable leaving margin.
- Does a bigger hitch increase capacity?
- Only if the receiver was your limiting factor. Vehicle ratings are unaffected by what you bolt to the frame.
More in Towing Capacity, Tongue Weight & Setup
The number in the brochure is not the number that limits you. The one that does is on a sticker inside your driver's door.
Read next
Head to head
Payload vs Towing Capacity
Why the tow rating rarely binds first, how to calculate your real limit from the labels on your vehicle, and what counts against payload.
Guide
Reading the Door Jamb Sticker
The certification label and the tire and loading placard explained, including the exact wording federal rules require.
How to
Measuring Tongue Weight
Three methods for measuring tongue weight, what each one requires, and how to interpret the result against the 10-15 percent band.
Reference
Hitch Classes Explained
The class system from 1 to 5, the two ratings on every label, and the mistake of inferring capacity from tube size.
Found something out of date, or a figure you can source better than we did? Corrections get read first. How we research explains how these pages are put together, and contact is one click away.