I've had my 28' fully loaded bumper-pull toy hauler hooked up and a ton a camping gear in the bed of the truck. (not really a "ton", but you know...) My toy hauler is very tongue-heavy at about 1400 lbs, and the truck settled down a bit in the rear but I don't think I'd call it 'sag". More like leveled. Our intention is to upgrade soon to a 30 to 35' 5th wheel, which is a big reason we bought this truck. If the bumper pull and some gear in the bed is enough to squat it a bit, I'm trying to be proactive with the air bags. I had a set of Firestone bags on my 06 2500 and used em all the time. I realize a bumper-pull will put more mechanical force on the rear simply because of the way-behind-the-axle connection point for the load, but even still a 5th wheel will have twice the load weight. Just trying to be careful. I guess I can get the 5th wheel first and see how it goes, and buy the bags if necessary. Was just curious if anyone has used this Torque brand and what they think of it. I'm not broke but I'm not made of money either, and this brand is a bit less expensive than the Firestone kit.