Towing Capacity, Tongue Weight & Setup
What Is Tongue Weight?
The downward force the trailer puts on your ball. Get it wrong in either direction and the rig tells you about it.
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Short answer
Tongue weight is the downward force the trailer's coupler applies to the hitch ball. It should be 10 to 15 percent of the loaded trailer's total weight. Too little causes sway; too much overloads the tow vehicle's rear and lightens the steering.
Where it comes from
A trailer balances on its axles. Load placed ahead of them presses the tongue down; load behind them lifts it. Tongue weight is the net result, and it is determined almost entirely by where things sit inside the trailer rather than by how much the trailer weighs.
That is the reason two identical trailers at identical total weights can tow completely differently. The one with the heavy items at the front has a reason to follow; the one with them at the back has a reason to argue.
The 10 to 15 percent band
| Loaded trailer weight | 10 percent | 13 percent | 15 percent |
|---|---|---|---|
| 2,000 lb | 200 lb | 260 lb | 300 lb |
| 4,000 lb | 400 lb | 520 lb | 600 lb |
| 6,000 lb | 600 lb | 780 lb | 900 lb |
| 8,000 lb | 800 lb | 1,040 lb | 1,200 lb |
| 10,000 lb | 1,000 lb | 1,300 lb | 1,500 lb |
Every figure in those columns comes directly out of your tow vehicle's payload.
What goes wrong below 10 percent
The trailer is close to balanced on its own axles, so very little force holds its nose down against the ball. A gust, a passing truck or a steering correction starts a yaw, and there is nothing damping it. Each swing feeds the next. This is the leading cause of trailer sway and it is almost always free to fix.
What goes wrong above 15 percent
The tow vehicle's rear suspension compresses, the front rises, and the front tires lose the load they need for steering and braking. You feel it as vague steering and longer stopping distances, and you see it as headlights pointed at the trees. It also eats payload faster than anything else you can put in a vehicle.
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 Measure it | Measuring tongue weight at home | Direct reading, no arithmetic | 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 Measure it continuously | Owners who will never visit a scale | Built into the hitch you already need | Check price on Amazon #ad Affiliate link - we publish no price; Amazon shows the current one |
| 3 |  Equal-i-zer 4-point Sway Control Hitch When it is high | Travel trailers that already sway | Redistributes the load the truck is carrying | Check price on Amazon #ad Affiliate link - we publish no price; Amazon shows the current one |
1. Measure it
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. Measure it 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 it is high
Equal-i-zer 4-point Sway Control Hitch
Equal-i-zer · Best for travel trailers that already sway
The reference point for integrated sway control. Friction happens at four places at once - both L-brackets and both sockets - so resistance is always on rather than something you remember to engage. Setup is bracket-height and bar-angle work, and it rattles; both are the price of a system with no separate parts to forget.
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
- Sway resistance is built into the geometry, so there is nothing to connect or disconnect at the ramp
- Works in reverse and in the wet, unlike a friction bar you have to release
- One assembly rather than a hitch plus a bolt-on sway bar
What does not
- Audible rattle and creak at low speed is normal and surprises first-time owners
- Bracket height and bar angle have to be set properly or the sway control does little
Skip it if
Skip it if your loaded tongue weight sits well inside your receiver's weight-carrying rating and the truck stays level - you would be buying hardware to solve a problem you do not have.
#ad Affiliate link - we publish no price; Amazon shows the current one
Raw specifications: Equal-i-zer’s own page. We earn nothing on that link.
Key takeaways
- Tongue weight is set by load position, not by trailer weight.
- The band is 10 to 15 percent of loaded trailer weight for a bumper pull.
- Below 10 percent means sway risk; above 15 percent means an overloaded rear.
- All of it comes out of your vehicle's payload.
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.
Common questions
- Is more tongue weight always safer?
- No. Up to a point more is more stable, but above about 15 percent you are overloading the tow vehicle's rear axle and unloading its steering axle, which creates a different and equally real problem.
- Does tongue weight change while driving?
- Only if the load shifts or a tank empties - which both happen. A trailer whose fresh water is forward and gray water is aft changes balance measurably over a trip.
- What is pin weight?
- The equivalent figure for a fifth wheel or gooseneck, where the load sits in the truck bed. It runs higher - commonly 15 to 25 percent - because the geometry is different.
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
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.
Best tongue weight tool
Best Tongue Weight Scales
Dedicated scales, scale-equipped hitches and the public weighbridge method compared on accuracy and how often you will actually use them.
Guide
Why Trailers Sway
The physics in plain terms, the three causes ranked by how often they are to blame, and how to tell which one you have.
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.
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.