200 Series GVW Frame Steering Assist GCSA Suspension
200M1-A1-SA 21,000 lb Steel Yes 5,688 sq in YesA
200M1-A1 21,000 lb Steel No 5,688 sq in YesA

175 Series GVW Frame Steering Assist GCSA Suspension
175M1-A1-SA 15,000 lb Steel Yes 4,536 sq in YesA
175M1-A1 15,000 lb Steel No 4,536 sq in YesA
A - Rockers w/ Main Frame Sideways Pivot