Towing Capacity for 4500 & 5500

[Desert Racer]

What is the towing capacity for the GM 4500 and 5500?

[More Power]

GVWR 16,500, 17,500 (C4500)
GVWR 18,000, 19,500 (C5500)

GCWR 24,000 with 11,000-lb. rear axle
GCWR 26,000 with 13,500-lb. rear axle

Jim