I have one and was curious to see if anyone else was using one. I know its not the usual rig to use, but my Touareg had air suspension with gives a 3in lift and a factory rear locker, so it has that going for it! So far on my Touareg I have stock 255/55/18 Nitto Terra Grapplers. Its also a 4.2 V8, so its got some grunt behind it, but it sucks in the MPG department. Now here are some pics of a concept rig built by VW.