Have a look at this hybrid combination of boat and 'tow' truck. The boat part is large enough to use as a van, while the truck half doesn't have any problems in reversing back down the ramp into the water.

https://www.bing.com/videos/search?q=boaterhome&docid=608039417877324359&mid=2C106E70DBFA3F9009702C106E70DBFA3F900970&view=detail&FORM=VIRE

Only in America.

Murray

Interesting concept thanks for posting.

He was a terrible movie maker though.  It could have been a really good vid.