Don't think it would be a good idea. I had an 05, 4.o with an auto, it towed small to moderate loads pretty good, but a crawler with a trailer would really tax that truck and probably work the rear end and tranny pretty hard. Especially if you factor in pulling grades. Not to mention going back down the grades. I sold mine and got a 2010 tundra with a 5.7, great tow vehicle.