[Davy Crocket]

They can make floating RV’s!

[GOPJ]

A reasonably price (and well thought out) house boat would be wonderful...

[Calvin Locke]

And Recreational Submarine Vehicles, aka "RSVs".

There's a quaint movie with William Hurt, "Rare Birds", that has as one of the story-lines Hurt's inventor-buddy thinking the Winnebago Corporation is after the personal sub (RSV) he built.