My buddy mounted a generator on the front hitch of his dad's fifth wheel. Then he built a gas tank, tested it for leaks and plumbed it all in.
You can loosen and bolt on some brackets to the front hitch mount, then fabricate something that will bolt on to the hitch.
The hitch itself is normally tempered steel, and you should not be welding to the hitch.
As for the rear bumper, normally that is not as strong, but that can vary with the manufacture. Some can barely support the weight of the drain hose inside the hitch, while some can tow a car with the factory bumper.
And how heavy for the generator.
Some recommend a pair of 2000 watt 47 pound generators connected together. This will run the A/C and have power to spare, in a light weight package.
Mayberrys.comWhen I have a motorhome built, I would prefer a Honda water cooled generator - they make 2, 4,500 and 6,500 watts. Those are fed from the main gas tank on a gas powered RV. They could be fed from a fuel tank mounted to the frame of almost any RV, if you add the tank, say from a junkyard car or truck.
Fred.
Money can't buy happiness but somehow it's more comfortable to cry in a
Porsche or Country Coach!
If there's a WILL, I want to be in it!
I havn't been everywhere, but it's on my list.
Kangen.com Alkaline waterEscapees.com