Replying to myself again. [mutter, mutter]
But I was looking for somewhere to post this and it is on topic. Elsewhere there is a thread about a modern equivalent to the Beetle for light weight, but this is about RVing.
Just A Car Guy: Nick made his own camper from his Honda Element (cheaper and more reliable than an old VW van)
Parallels to a VW camper include the rock-and-roll bed and double side doors; but I was struck by the side-sliding cabinet door that allows for the bike handlebar, and the outdoor sink that addresses slowmover's concern. Sorta.
As for the hybrid part, a
watercooled 20hp alternator is apparently the easy way.