My '96 T100 has the 3.4L and I set it up to haul 2000 pounds in the bed and another 2000 pounds in a 900 pound trailer.

I installed TRD headers, HD Alcan rear springs, HD T-bars, HD Bilsteins, a Hellwig and an Air-Lift system with on board controls.
Towing and hauling are not a problem. I turn the O.D. OFF and stay in 3rd gear.

Stopping in a short distance is another story...