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Seriously , most folks should probably rent a motorhome for the once or twice a year they get used . The old adage about boats apples to motorhomes also . Dusty
And you forgot insurance costs.
Not to mention registration cost that varies widely from 1 state to the next. Never had a class C or larger MH but travel trailers are cheap to insure at least in the states I've lived in.No matter what MH, PU/trailer you get figure 6 mpg. Then figure $25? a night w/hookups @ a KOA(may be higher now). Forget about economy when you go this route. It's going to cost you more than motelling no matter what. The only thing you don't have to do is move your stuf in/out the motel room. You will even see RVs in motel parking lots for the night. I have RV'd since the `80s. Started out w/a Toyota Chinook pop top. Then a 16' TT, then a 23' 5th wheel I lived in for 10 mo. going thru a divorce. Now have a 24' toy hauler which get's used little. Recently put a roof over it to protect it from the elements. It's worth more to me as an extra guest room than what it's worth now.