Via @stilsucht, an amphibious RV, a houseboat on wheels. Truly convertible, the Sealander’s waterproof chassis allows it to be launched directly, literally rolled into the water.
Compact and configurable, the Sealander’s roof can be opened or removed, and the interior modules modified or removed as well. Small, light, with a low-power electric motor, means no special operator permits are required in many locations, on land or water. More at Sealander.