I am thinking in towing a 15000 LBS GCWR 5th wheel with a 2011 3500 Chevrolet Silverado durmax 6.6/Alison 3.73, 4x4 crew cab LB. The specs show on the TV the max towing weight is 16800 for a 5th wheel...
What do the tow specs tell you? If you dont have the specs then get them from the manufacturer. You are legally liable for having an adequate tow vehicle, dont rely on personal opinions, get the facts.