I doubt any of the rentals have gen sets. I bought a little 2 cycle 1KW for charging the house battery. I also got one of those Black and Decker inteli chargers but I can only use it at 20 amps. I welded another hitch on the rear and mounted the genny on that. Now that we don't take the scooter I may rig up the 3KW genny I have using the two hitch recepticles.
Righ now I'm trying to find out why the house battery doesn't charge from the alternator while we are driving. What a mess of wires around the isolator solenoid.
I'll bet there are a lot of similarities between our two RV's