I would be concerned about the stress forces this would put on the frame of your coach.
I had considered a carrier for a razor and settled on a carrier that used two receiver hitches about 5' apart, it had two caster type wheels on the rear and receiver to attach your tow bar for your toad. It was a little pricey for my blood but would prevent damage to the motor home frame.
Jerry & Anna
Retired Navy - 55 yrs Aircraft Mechanic/Pilot
2007 40 Ft Tiffin Phaeton, 2016 Ford Explorer