Jeff,
As a many year veteran member of the EAA and a guy thats been to Oshkosh a time or two, do you really think this is the place to try to market a shell or a bus?
We are talking die hard airplane guys here that live and breathe the things, to most of them a Prevost is just another form of Winnebago, in fact Winnebago probably has better name recognition. Now, if you had a cherry P-51, a newly built Starduster, even a tricked out Lancair, that would be a whole new ball game. The vendors, and there are a bunch of them, are all airplane people. These guys for the most part would never consider driving to Oshkosh; this is a big fly in! Anyone who is anyone flies to Oshkosh (sorry Pogger's), the big kids bring their jets, the small fry's poke in piloting LSA's.
Personally if I was trying to sell one of these badly, NASCAR would probably be the place, certainly not Oshkosh. For whatever that is worth..
John