The step bumper is/was rated for 500lb tongue weight and 5000lb pull, but you would be foolish to attach anything close to that much to the bumper of a 20yr old truck. I have pulled 2-3k on the bumper of these trucks with no problems at all.. no bending or sagging so it is stronger than it looks. A while back in another similar post sombody posted a pic of one of these trucks with a tandem travel trailer attached that was in an accident, and while the bumper got bent the trailer and bumper were still attached to the truck.