The specs say for a 2015 Chevy Silverado 3500HD, Double cab, long box, 6.0 vortec, 4X4.
GVWR is 11,000 lbs. + Max Conventional Trailering, 4.10 Rear Axle 13,000 lbs. = GCWR 24,000 lbs.
GVWR is 11,000 lbs. + Max 5th Wheel Trailering, 4.10 Rear Axle is 13,900 lbs. = GCWR 24,900 lbs.
This tells...