You're probably right about generators in 8-8.5' campers. It makes sense because of the limited size of the rear storage compartments on a camper that size, and then only on short bed models.
I don't think I'd go with an onboard generator myself, just because I've never seen one of those Onans that ran worth a hoot. Friend of mine had a 1999 Class C with an Onan. Had to crank on it for 3-4 minutes to get it running. Before you blame it on poor maintenance, he traded for a brand new class C a couple years ago now and that generator takes forever to start too! He didn't even have it long enough to maintain it poorly! Brand new off the lot, it takes 3 minutes of cranking and several stalls to get it going. Dealer says nothing's wrong.
