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

150 Series GVW Frame Steering Assist GCSA Suspension
150M1-A2-SA 12,500 lb Aluminum Yes 3,776 sq in YesB
150M1-A2 12,500 lb Aluminum No 3,776 sq in YesB
150M1-A1-SA M 12,500 lb Steel Yes 3,776 sq in YesC
150M1-A1-SA 12,500 lb Steel Yes 3,776 sq in YesC
150M1-A1 12,500 lb Steel No 3,776 sq in YesC
150M1 12,500 lb Steel No 3,776 sq in N/A
A - Rockers w/ Main Frame Sideways Pivot B - Rockers w/ Rubber Cushioned Mounts C - Rockers