Another scammer posting fake RV/camper/trailer ads on craigslist.
They have no real RVs to sell; they will direct you to a fake eBay, Paypal or Amazon page, or ask you to send money via prepaid card, Amazon or iTunes to a fake "shipper."  They will probably give you a sob story about selling the RV because its original owner died, or that they're on an oil rig or overseas in the military.

Never pay for a vehicle you can't inspect in person.