Runs the two checks most first-time towers skip: the trailer's loaded weight against the tow rating (with an 85% comfort line) and the payload budget, meaning tongue or pin weight plus passengers, cargo and the hitch against the door-sticker payload. Looks up published tow and payload ranges for about 55 common US trucks, SUVs, vans and crossovers with the configuration notes that explain the range, estimates loaded trailer weights by type and length, and lists the required gear (hitch class, ball size, brake controller, weight distribution, mirrors). It always tells you which number failed.
Typical requests: can my truck tow this trailer, how much can a Ford F-150 tow, towing capacity of a Toyota Highlander, how much does a 25 foot travel trailer weigh, do I need a weight distribution hitch, what payload do I need for a 7000 lb trailer, tongue weight calculator, fifth wheel pin weight, half ton vs three quarter ton for a camper, do I need a brake controller, towing mirrors, best SUV to pull a camper.
Every result is shown as a card with the verdict, the numbers that passed or failed, the gear list and links to the matching hitch, brake controller, scale and mirrors (physical goods) and to camptow.com. No account needed.