[maple_leaf_eh]

From the years of the base trucks, it is clear that a 4x6 generic "army truck" was the basis for fabricating amphibious passenger vehicles. They look like WW2 DUKWs, but are far from original.

That said, a fellow wouldn't need cameras, passenger seats or a lot of length to have a versatile although compromise road/trail/lake/river vehicle. Think about that nutter who took a slightly modified Jeep Duck around the world.