Motor home & a double decker trailer with a 12 volt hydraulic lift for the upper deck. Heck, a winch w/cable & pulley system could accomplish the task.
A larger boat on a trailer if you wish, backed on the lowered top deck.
Raise up the deck & drive the Sammie, or even bigger vehicle, if you wish, on the bottom deck.
I saw an outfit like this in the Keys a few years ago & it blew me away. It was a high dollar outfit, but the concept could fit most budgets that are allowing this type of traveling.
