I really appreciate all your guys' input, definitely more info than I'm gonna get from Chevy. Honestly it sounds like as long as I'm not towing a 30,000 lb trailer and driving wrecklessly I should be alright
Ok, here is what I’ve got for my 2013 crew cab long box…
from: Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 3/29/12
9-40 Driving and Operating
Black plate (40,1)
Vehicle Axle Ratio Max. Trailer Wt. GCWR *
Crew Cab Standard Box — Conventional Trailer 3.73 5 897 kg (13,000 lb) 11 113 kg (24,500 lb)
Crew Cab Standard Box — Fifth-Wheel Trailer 3.73 4 899 kg (10,800 lb) 11 113 kg (24,500 lb)
Sierra Denali — Conventional Trailer 3.73 5 897 kg (13,000 lb) 11 113 kg (24,500 lb)
Sierra Denali — Fifth-Wheel Trailer 3.73 4 536 kg (10,000 lb) 11 113 kg (24,500 lb)
Regular Cab Long Box — Conventional Trailer 3.73 5 897 kg (13,000 lb) 11 113 kg (24,500 lb)
Regular Cab Long Box — Fifth-Wheel Trailer 3.73 5 761 kg (12,700 lb) 11 113 kg (24,500 lb)
Extended Cab Long Box — Conventional Trailer 3.73 5 897 kg (13,000 lb) 11 113 kg (24,500 lb)
Extended Cab Long Box — Fifth-Wheel Trailer 3.73 4 944 kg (10,900 lb) 11 113 kg (24,500 lb)
Crew Cab Long Box — Conventional Trailer 3.73 5 897 kg (13,000 lb) 11 113 kg (24,500 lb)
Crew Cab Long Box — Fifth-Wheel Trailer 3.73 4 536 kg (10,000 lb) 11 113 kg (24,500 lb)
C-3500 Pickup Model Extended Cab — 2WD
Single Rear Wheels — Conventional Trailer 3.73 5 897 kg (13,000 lb) 11 113 kg (24,500 lb)
Single Rear Wheels — Fifth-Wheel Trailer 3.73 7 620 kg (16,800 lb) 11 113 kg (24,500 lb)
Dual Rear Wheels — Conventional Trailer 3.73 7 484 kg (16,500 lb) 13 835 kg (30,500 lb)
Dual Rear Wheels — Fifth-Wheel Trailer 3.73 10 387 kg (22,900 lb) 13 835 kg (30,500 lb)
C-3500 Pickup Model Crew Cab Standard Box — 2WD
Conventional Trailer 3.73 5 897 kg (13,000 lb) 11 113 kg (24,500 lb)
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Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 3/29/12
Black plate (41,1)
Driving and Operating 9-41
Vehicle Axle Ratio Max. Trailer Wt. GCWR *
Fifth-Wheel Trailer 3.73 7 620 kg (16,800 lb) 11 113 kg (24,500 lb)
Sierra Denali — Conventional Trailer 3.73 5 897 kg (13,000 lb) 11 113 kg (24,500 lb)
Sierra Denali — Fifth-Wheel Trailer 3.73 7 484 kg (16,500 lb) 11 113 kg (24,500 lb)
C-3500 Pickup Model Crew Cab Long Box — 2WD
Single Rear Wheels — Conventional Trailer 3.73 5 897 kg (13,000 lb) 11 113 kg (24,500 lb)
Single Rear Wheels — Fifth-Wheel Trailer 3.73 7 575 kg (16,700 lb) 11 113 kg (24,500 lb)
Dual Rear Wheels — Conventional Trailer 3.73 7 484 kg (16,500 lb) 13 835 kg (30,500 lb)
Dual Rear Wheels — Fifth-Wheel Trailer 3.73 10 342 kg (22,800 lb) 13 835 kg (30,500 lb)
Dual Rear Wheels — Sierra Denali — Conventional Trailer
3.73 7 484 kg (16,500 lb) 13 835 kg (30,500 lb)
Dual Rear Wheels — Sierra Denali — Fifth-Wheel Trailer
3.73 10 297 kg (22,700 lb) 13 835 kg (30,500 lb)
K-3500 Pickup Model Regular Cab — 4WD
Single Rear Wheels — Conventional Trailer 3.73 5 897 kg (13,000 lb) 11 113 kg (24,500 lb)
Single Rear Wheels — Fifth-Wheel Trailer 3.73 7 711 kg (17,000 lb) 11 113 kg (24,500 lb)
Dual Rear Wheels — Conventional Trailer 3.73 7 257 kg (16,000 lb) 13 835 kg (30,500 lb)
Dual Rear Wheels — Fifth-Wheel Trailer 3.73 10 478 kg (23,100 lb) 13 835 kg (30,500 lb)
In short, having the duramax adds significant gvwr.
thanks,
rob