Where do you find the weight of the motorhome?

The weight rating should be located either inside the glovebox or inside the frame of the driver's side door. If you want to find out how much your vehicle weighs at any given moment, you can take it into the scales at a truck stop and weigh it there... I believe the charge for Cat certified scales is something like $8.50 or $9.00. While motor homes are not subject to FMCSR, they are still subject to weight limitations.