I know very little about RV's, never owned one. But I'd be awful leery of sleeping in anything with 40 gallons of gasoline stored beneath me, and questionable wiring throughout.
I assume most today must be diesel? With all of today's safety regulation, it's almost hard to believe they're even allowed to put gasoline engines in RV's, anymore.
I grew up on and around boats, and watching gasoline boats eplode at the marina was not a completely uncommon experience. Never saw a diesel boat explode, but I do remember a fire occurring on one large diesel party boat I was on, safely extinguished.