I found a RS4 nitro touring car at a flea market for $50 and grabbed it in hopes of converting it to electric. After some investigation, that turned out to be more effort than it was worth, so I traded it to some guy online for a bone-stock wheely king roller. An HPI crawler conversion kit, some extended suspension tubes, axle-mount for the servo, and hobbywing 35A crawler combo turned it into a respectable rock crawler. Losi Comp Claws on generic 2.2" beadlocks do a fine job of getting it up and over. The stock 1/12ish shell looks silly on the stretched wheelbase, so I have a proper 1/10 '85 Blazer shell in the works.