Just picked up a used 1/10 Cen Racing Magnum NX Nitro Truggy the other day. It has some monster truck tires on it. When the truck shifts into 2nd gear and gets moving on the street the tires shake like crazy. Do I need lower profile or harder tires to run it at high speeds? Tires appear to be on the rims evenly. There is a bit of slop built into the rear wheel linkage that may be allowing this. The upper adjustable suspension rod seems like it could be a little loose. Is it designed that way?