So, set up a 501(c)3, a 508 or similar for the auction. Alternatively, one could establish an LLC ($100 - $200 usually) in a state where the not-for-profit rule does not apply, then collapse the entity after the raffle is complete, passing the proceeds through accordingly, to the LLC partners.
Further, donating the van to a charity with 501(c)3 status, such as the Blue Ribbon Coalition, whilst contractually stipulating they raffle the van and receive a portion of the proceeds for doing so, puts their lawyers on the hook for making it work if they want the donation.
or, you could just sell it on eBay or Craigslist and take the short term capital gain on it