The only difference I have been able to find is the transmission, which would probably result in different gear ratios, which would lessen available power to carry additional weight as evidenced on the rear axle and GVWR ratings.. I can find no difference in the axle suspension or drive train other than the trans and components.
Engine Cummins ISB 340HP Cummins ISB-XT 360HP
Torque (Ft. lb.) 660 800
Transmission Allison 2500MH Allison 3000MH
Hitch Rating (LBS.) 5,000 10,0000
Wheels Stainless Steel Simulators Aluminum
Front GAWR (LBS.) 10,410 10,410
Rear GAWR (LBS.) 17,500 19,000
GVWR (LBS.) 27,910 29,410
GCWR (LBS.) 32,910 39,410
Fuel Ta nk (GAL) 100 100
DEF Ta nk (GAL) 13 13
Tires 255/80R22.5 XRV LRG 255/80R22.5 XRV LRG
2013 Berkshire 390RB DP/360--(Toad)2009 Trailblazer.
3rd generation Disabled Veteran, oldest son is 4th Generation Disabled Veteran...its a family tradition.