If you are buying a used RV from a private party, you are always paying cash... The seller gets cash whether you pay cash or go to the bank, get a loan and hand him a cashiers check, he gets cash. Even if you buy from a lot, at the end of the day, the dealer gets cash and might even get a kick back if he helps you get financing.
I guess if you have cash in hand the seller gets paid faster, but when I bought my RV, I looked at it, made an offer, came back that weekend with a cashiers check and hitched up drove home. It was cash as I didn't get a loan, but paid with a cashiers check vs personal check or straight cash.
I don't think there's any benefit to a seller if you say I'm paying cash unless you have a briefcase full of cash and you are planning to hand it to them right then and there...
