Place a trade ad in Craigslist
Call area boat dealers to see if you can find one with an interest/willingness to take a trade
I think you will find easiest to see the RV outright, then buy a boat
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.