At the moment we are towing a 21FBS NorthTrail TT, but are coinsidering up-grading to a Heartland Sundance Xlt 287RL Fifth-wheel (Ultra-Lite) My 2004 Extended Cab, w/8 foot box, Silverado, is fully loaded, Trailer Package, 4WD Z71, 410 gears, etc. I also installed Hellwig Air Springs..My truck...