2005 suburban 2500 6.0 3.73 gear? anyone towed with one?

I run a 6.0L GMC 2500 4x4 gas with 3:73 and love it. Don't tow much, but haul a 3200 lb Camper, and often tow a cargo trailer at the same time with "TOYS" in it.

It runs about 3000 lbs loaded up, plus TC at 3200 - so about 6200 lb tota. So, that's a pretty good weight - I have no trouble with it - got 197,000 miles on it and just today towed the trailer etc a few hundred miles and it still sings.