rafting - I gave more thought to the "flight" part of operating a hovercraft, too. Variable swing-out propeller shafts *could be* something akin to someone using the swing-wing feature of the Skystriker XP-14F!
As well, the "slide-out" extending deck essentially could be a towed "air-cushion barge," of sorts. Deck cranes could secure the vehicle which would be suspended solely under the frame, rather than having all wheels on a deck (decreasing the need for more material).