The downward force of heavy trailer tongue weight causes the front of your vehicle to lighten up and rise as the vehicle pivots over the rear axle. This causes the vehicle’s weight to be unbalanced and steering traction will be lost. This is a dangerous situation because of the lack of control and fishtailing of the trailer.
Weight distribution bars used with Air Lift air helper springs (also called air bags) provide maximum stability and control of your towing vehicle and trailer. Air Lift air springs provide load assistance for your sagging vehicle, and the weight distribution bars redistribute the load and balance your vehicle.
In many situations, heavier weight distribution bars are used to remedy weak suspensions or when additional cargo in the vehicle causes it to sag. Doing so will result in an unbalanced vehicle, excessive tire wear, and an uncomfortable ride. Add and adjust the correctly sized weight distribution bars to solve your weight balance problems and then add and adjust Air Lift air helper springs to fix your suspension problems.
Start by selecting the correct distribution bars. The bars must be rated for the tongue weight of the trailer (i.e., 500-pound bars for a 500-pound tongue weight). With the vehicle UNLOADED, take reference measurements at the front and back of the vehicle to the ground. Then connect the trailer and start loading the bars one chain link at a time, keeping the links equal on both sides. As the load on the bars increase, the rear of the vehicle will come up and the front will come down. When the front and rear of the vehicle are as close to the reference measurement as you can get (within ½” at the front), the bars are tensioned correctly. When the bars cannot be adjusted tightly enough to achieve similar or identical vehicle-height reduction, add air to the air springs to bring the vehicle back to the correct height and balance.
When adding cargo to the vehicle or trailer, do not compensate for inadequate suspension by using higher rated bars, or readjusting the bars, as this will cause for an unbalanced vehicle. Use additional air pressure in your air springs to bring the vehicle back to the correct height.
Fine tuning vehicle stability can be accomplished by an adjustment to the air pressure in 5 PSI increments until the desired “feel” is achieved. Adding air may require readjustment of the bars.