My only ride of interest isn't a car, but it does float. Most of the time at least.. sometimes it almost sinks.
Some specs of interest:
The Tonic is a Parker Dawson 26, and is 25'11" end to end.
It weighs about 8000lbs, and can fly on the water at 3 knots with it's 8hp 1 cylinder diesel engine.
Luckily, it only needs about 20" of water which lets me get into a cheap dock. When the keel is swung down, it pulls about 5'4" draft after 75 turns of the winch.
"Comfortably" sleeps 6, and is fully equipped with all the bourbon you can handle.
If anyone knows how to sail, I should probably learn at some point..