Very good points Bob, in fact I've been concerned about the transport costs as well... even for vehicles w/o boats!
I will continue to look for capeside options, perhaps anyone else who can do some legwork could do so too.
BTW - the Nantucket Sound stretch from Monomoy west gets it's share of bonito in August. I have a up-to-the-moment connection in the fishing business who can inform us of their presence in that stretch. Lodging and access is easy as pie, although it lacks the romance of a Washburn or an MV. My point is, I think there are several ways to skin the cat.