Here's my Knex rock crawler. It has four wheel drive and full rubber band leafspring suspension. The frame, axles, hood, suspension, and interior are mine but the body panels and cab are gunner1089's. The suspension is a 4 link with a track bar, front and rear. It has an 8 point roll cage. It's driven by 2 motors one per axle. each axle is geared down for better crawling.