This is one of the latest creations from Zblj, a Technic/Racers hybrid offroader which uses the wheels and some other parts from 8675, Outdoor Challenger (Outdoor RC subtheme, from Racers).
This is a less obvious combination that most, should never though about.
But the result is quite impressive and versatile. This monster can climb on a smooth surface at 55 degree angle.
According to Jernej it features an independent left/right side wheel drive, very flexible 4 link suspension on both axels, lighter body and bigger wheels with more traction and profile.
You may find more photos from the Avenger, at Jernej's Brickshelf folder.