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

105 Series GVW Frame Steering Assist GCSA Suspension
105M1-A2-SA 10,500 lb Aluminum Yes 3,776 sq in YesB
105M1-A2 10,500 lb Aluminum No 3,776 sq in YesB
105M1-A1-SA M 10,500 lb Steel Yes 3,776 sq in YesC
105M1-A1-SA 10,500 lb Steel Yes 3,776 sq in YesC
105M1-A1 10,500 lb Steel No 3,776 sq in YesC
105M1 10,500 lb Steel No 3,776 sq in N/A
B - Rockers w/ Rubber Cushioned Mounts C - Rockers