Whoaaa. Another forum off to the races. pugslyyy must have been stinkin rather than thinkin when that was written. Just can't believe an rv'er could believe that.
My 1999 Lance camper with that cheap little Onan rattler had around 780 hours when I sold the camper with nothing more than very routine maintenance and a couple shop visits for it. One was a circut board $200, the other the propane feed controller $160. I do a lot of prevent maintenance also. Replace it before it breaks.
It's OK to run generator while driving. I've never checked variance in mileage.
Hope this helps.
Bry.