Frank,
Ther is a loosely knit group right now. We use
www.clubgwagen.com as a base for now. There is a link there to a Yahoo group forum as well, tons of good info floating around.
Kuan,
Sure, I'm not responsible for ripping off any errant plastic body parts though! I have even constructed a small "test track" for my G and Unimog. I dug some BIG holes and alternated them so the truck "teeters" and leans like crazy! I have yet to NOT scare the pants off a passenger demonstrating the trucks capabilities. I wouldn't be too surprised if an ML made it through. You may have trouble with clearance, but it is all soft dirt so...... Well at any rate if the ML gets stuck the Mog can get it out.