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I would not put much more than about 500# tounge weight and 3500# total weight. I have snapped bumpers off my truck with about 4000# trailer and 350# tongue weight. A shock load such as a large bump or hard breaking could due some harm.
I pulled about 4200 on the bumper a while back and it did alright. I've since gotten a receiver hitch, so I don't have to do that anymore. It made me pretty nervous looking at the trailer on the bumper, but I had no problems.
My grandfather tried pulling a Maxum 28 ft boat with his F250 460. Lets just say that bumber didn't hold up to well. I have a hercules bumber on my truck that can pull 12,000lbs.
Yeah, I would limit it to about 4000lbs. I have pulled more, but I wouldn't do it again. You'll be much happier with a receiver hitch. I noticed a huge improvement in the way the RV towed.