I keep my eyes open, but only have a few things, so please add whatever you have.
There is a U1650 with 4 wheel steering rumored to be in Montana, and I believe the rumor is true, but I have not made it up there just yet.
On your first post of pictures in the bottom right it appears they had the differentials locked to make that sharp turn. Anyone else get a tingly feeling thinking about turning sharp on dry concrete with full lock on? It makes perfect sense when looking at the rubber marks...
Gosh, maybe I should have lengthened my wheelbase and gotten a bigger camper and gotten rear wheel steering for my U500. But I imagine rear steering reduces the GAWR in the rear from 8500-9000kg down to 7200kg. Important for my application.