Sealander Schwimmcaravan
Built in Germany, this amphibious camping trailer can be towed like any other middle lane bothering caravan.
But drive to a lake or any other expanse of relatively calm water and you can back it in to the wet wobbly stuff and enjoy the tranquil surroundings as you bob around, propelled by a 5hp electric motor which doubles up as a source of energy for various on-board mod cons.