GMC Sierra 2015 Owner's Manual page 341

9-74 Driving and Operating
Use the following chart to determine how much the vehicle can weigh, based upon the vehicle model and options.
Weights listed apply for conventional trailers and fifth-wheel trailers unless otherwise noted.
Vehicle
1500 Series 2WD Regular Cab Standard Box
4.3L V6 (b)
4.3L V6 (b)
5.3L V8
5.3L V8
1500 Series 2WD Double Cab Standard Box
4.3L V6 (b)
5.3L V8
5.3L V8
5.3L V8
6.2L V8
6.2L V8
Maximum Trailer
Axle Ratio
3.23 2 767 kg (6,100 lb)
4.10 2 087 kg (4,600 lb)
3.08 3 175 kg (7,000 lb)
3.42 4 082 kg (9,000 lb)
3.23 2 540 kg (5,600 lb)
3.08 2 948 kg (6,500 lb)
3.42 4 309 kg (9,500 lb)
3.73 5 080 kg (11,200 lb)
3.23 4 309 kg (9,500 lb)
3.42 5 443 kg (12,000 lb)
Weight (c) GCWR (a)
4 990 kg (11,000 lb)
4 309 kg (9,500 lb)
5 443 kg (12,000 lb)
6 350 kg (14,000 lb)
4 990 kg (11,000 lb)
5 443 kg (12,000 lb)
6 804 kg (15,000 lb)
7 575 kg (16,700 lb)
6 804 kg (15,000 lb)
8 029 kg (17,700 lb)