the 4 casters under peice of plywood and just two 2 x 12's cut to length and stood on side and positioned exactly where the frame sits. bolt all of this together using lag bolts up through plywood into bottom of 2 x 12 and down through the body mounting bolts in floor of car into the 2 x 12. this lets you paint the bottom of body on same dolly as only areas where frame will be sitting won't get paint. paint3.jpgpaint2.jpg