That Unimog pic is hilarious! It's an awesome rig but next to the Miata in an apartment parking lot it's pretty funny. Imagine someone walking outside one morning and seeing that thing next to their car and thinking Bear Grylls had moved in next door!
BTW, I agree with Dave completely. As expensive as SMBs are I don't think it will be easy to find a volunteer, but it's certainly worth a try. You might have better luck just finding an owner to take you both out for a weekend.