5th wheel Towing capacity of 1993 gmc Sierra 3500 dually 6.5

I have had two of those trucks. I can tell a short horror story about by 93' 3500 CC DRW. I was "attempting" to pull a piece of equipment over the Teton Pass with my 93. Total weight was about 13-14K. I got about 3/4 the way up the pass and had to turn around. I couldn't make it up, I don't suggest trying to turn around with an equipment trailer on the Teton Pass. Obviously I lived to tell the story, but I wont forget it. I bought my first Duramax days after that fiasco in July 2001 If you want to consider something that puts old power in perspective, the specs on the 6.5T were approx. 195 hp and 385 foot/pounds. The little Dmax in the Canyon is 181 hp and about the same torque.