I have towed a couple of heavy loads of fence panels on a 6.5x10 utility trailer with my 3.7L before, but not a travel trailer. The 3.7 did better than I thought it would. That engine pulls pretty good, but I wouldn't want to pull heavy with it every day. The safe towing capacity would be the same as any other 1500, but the power would be the only thing holding you back. Actually I have an 850 pound sub box in the bed I haul everyday. That with the 22's make the truck a dog off the line, but once you get it rolling it will hold its own.