If you make the bet big enough the RV will become real.
Let me explain in case you haven't figured out the thinking of a con artist.
If you make a $100,000 bet with me, with proof that your $100,000 is in escrow, I can guarantee you that I can get a $600,000 RV to win your $100k.
All I need to do is promise my investor or front man $60,000 for the RV for two or three days use... including a totally legal lease/buyback deal. He gets $60k and I keep $40k for a few hours of work including showing you the RV and the paperwork.