Feld is switching to the CRD chassis' because they are all Computer designed and made. They are cut and bent by computers. So if some one breaks or cracks a a bar in the chassis, they can look up its number and order a new one. And the are 3 Max-D's. the original Wilman Chassis, the new CRD chassis, and Tom's Wilman with a modified craddle which looks like a patrick craddle to me.