You camper has a single air conditioner I assume? I would think the 3,000 watt Champion ought to be able to run that. Have you really gone over the engine? Does the engine possibly have issues from ethanol gas? Clogged fuel line, collapsing fuel line, clogged fuel filter, clogged carb, etc?
I noticed the "Brutepower" generator in the link you provided does not seem to list noise level... usually means it is LOUD! Looks like a perfectly good generator, same as all the others of that type (open frame, contractor type).
