C3500 9 C-Series Topkick 2 Envoy 8 Jimmy 8 Motorhome Chassis 2 Safari 11 Savana 1500 8 Savana 2500 10 Savana 3500 10 School Bus Chassis 2 Sierra 1500 15 Sierra 1500 HD 13 Sierra 2500 13 Sierra 2500 HD 18 Sierra 3500 17 Sierra Denali 12 Sonoma 10 T-Series 3 W3500 Forward 10 W4500 Forward 11 W5500 Forward 12 W6 3 W7 2 Yukon 13 Yukon Denali 12 Yukon Denali XL 12 Yukon XL 1500 10 Yukon XL 2500 10