One is the amount of spring bar tension, made by adjusting the length of the chains or support bracket, and the other is adjusting the angle of the ball mount in relation to the tow vehicles hitch. There are two main adjustments that are made to a weight distribution system to achieve the desired amount of weight transfer. What the weight distribution system does is, in essence, stiffen the pivot point at the coupler/ball mount, using the spring bars which are anchored at one end in the ball mount, and tied to the trailer frame behind the coupler using either support chains or support brackets. and, there is a vertical pivot point where the trailer coupler meets the ball on the ball mount. The heavier the tongue weight, the lower the rear suspension squats and the higher the front of the tow vehicle lifts. Since the ball mount is behind the tow vehicle's rear axle, this tongue weight causes the front end of the tow vehicle to lift because the rear axle of the tow vehicle acts like a fulcrum point of a lever system. When towing without a weight distribution system, all the tongue weight generated by the towed vehicle is directly applied to the ball mount through the ball coupler on the trailer. As I said in my earlier post, most weight distribution systems are incorporated into a specifically modified ball mount, and using the spring bars, which are locked into the ball mount, they impart a rotational torque to the tow vehicle through the hitch mounted on the vehicle. The principle behind all (as far as I know) weight distribution systems is to, using the spring bars, transfer some of the felt tongue weight on the rear of the tow vehicle to the front wheels. I don't know if I can adequately explain the principle of a weight distribution system in just words (ya know what they say about a pic being equal to 1,000 words). There is an incredible difference when using it but if I run the risk of damaging my 4Runner I will stop. I recently started using a weight distributing hitch on my V6 4Runner. I am not disagreeing with you here but I would like to know how you came to this understanding. Thank you,I'm not worried about trailer 's the tongue wght.you can't put anywhere near 500lb tongue wght on the back of a 5th gen 4 runner,without the axle hitting the bump stops.Thought the hitch was mounted like a ford/chevy,should of realized this before purchase And I don't know if the frames between the 4th gen and 5th gen are close enough to allow a 4th gen frame mounted hitch to fit the 5th gen. I do not know if there are any aftermarket 5th gen frame mounted hitches available yet. Since Toyota, as far as I know, does not have a V8 option available for the 5th gen 4Runners, I doubt they have a factory frame mounted hitch available. If you need a weight distribution system to control sway or handle a heavier trailer, you MUST have a frame mounted hitch for it to work properly and not damage the rear crossmember. When a weight distribution system is used with it, the rotational torque is applied directly to the frame rails through the hitch. On the other hand, the frame mounted hitch, like those on most V8's, is designed to be used with a weight distribution system because it is directly mounted to each of the main frame rails. It is NOT designed to be used with a weight distribution system, because the rear crossmember it is mounted on is not designed to handle the rotational torque stress that a weight distribution system will put on it. It is rated for 500 lbs max tongue weight and 5,000 lbs max pull weight. The oem weight carrying hitch (for the V6's) is mounted to the rear crossmember, underneath the bumper cover. I don't have any experience with the 5th gen 4Runner, so I am going to use the 4th gen setup for reference. They are two different hitches, and on the 4th gen 4runners, they are mounted differently on the vehicle. I think there is a misunderstanding about the difference between a weight carrying hitch and a weight distribution hitch.
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