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Well with my old 99, 3.9L, 4x4, 5speed, i used to put one snowmobile in the bed hook up to a 2 place inclosed snowmobile trailer with 2 sleds in it, and with 3 people in the truck also, reg cab, it pulled everything great. with no problems, it just didnt like slowing down.lol
put a decent bolt-in class 3 or 4 hitch, and go hauling. First gear is a big tall for a real heavy load, and you're limited on tongue weight, but i'd say it's good for 3-4,000 pounds? Like red said, towing will be the big thing. Trailer brakes highly reccomended for the heavy ones.