How we source and verify our numbers

This site is a reference tool, and reference tools are only as good as their data. Here is exactly how the numbers behind the calculators and guides are compiled, cited, checked, and kept current — and, just as important, what this site is not.

Where the numbers come from

Every value is drawn from public, authoritative sources: SAE recommended practices for trailer hitches and tow ratings, NHTSA and U.S. federal definitions (49 CFR), and the published capacity charts, torque specs, and setup instructions of major hitch and towing manufacturers (CURT, Reese, Equal-i-zer, Weigh Safe, Blue Ox, U-Haul, and others). We do notreproduce copyrighted rating tables verbatim; we summarize widely published engineering guidance and link to the originals so you can check them.

Every page carries a Sources box listing the specific references behind that page's numbers, with a "last verified" date.

How we verify

• Multiple sources per value. Key numbers (percentage bands, hitch-class ratings, weight-distribution thresholds) are cross-checked across independent references.
• Adversarial review. The dataset was compiled and then independently fact-checked, with each claim confirmed against a primary source or flagged. Where sources genuinely disagree, we present the range rather than a false-precision single number.
• Ranges, not false precision. Hitch, ball, and spring-bar ratings vary by manufacturer, so we show typical ranges and tell you the product's own label governs.

Review status (in plain terms)

This site is built and maintained by Hemant Rawat, an independent software engineer. It has not been reviewed by a licensed towing or trailer professional or a professional engineer. The calculators implement well-established, publicly documented formulas and percentages — but they are a starting point, not a substitute for:

• the weight ratings and instructions in your tow-vehicle owner's manual;
• your trailer's documentation and data plate;
• your hitch and ball-mount manufacturer's rated capacities; and
• weighing your fully loaded rig on a scale.

When those disagree with anything here, they win.

How current it is

The dataset was last verified July 2026. Standards and manufacturer specs get revised, so we re-check periodically and update the "last reviewed" dates when we do.

Found something wrong?

Corrections make this better for everyone. If a number or source looks off — especially with a manufacturer or standards reference we can check — please emailcontact@tongueweightcalculator.com. We fix confirmed errors promptly.