I think 1000# bars would be adequate, 1200# bars would give a little upgrade room. I have towed for the last 20+ years with a friction type sway bar and they seem to work just fine, especially when you can get one for $50.00 or less. I also turn in forward and reverse, go up and down hills and broke only one after 5+ years of use. Metal fatigue? What you do want to watch is how much you tighten them. Just snug the handle down and you're good to go. Don't jump up and down on it to tighten, remember, it's only a damper and not a brake.