Trunnion Weight Distribution Spring

My opinion—yours may vary: X2 with BarneyS with some elaboration. Pickup trucks are designed to come down significantly in the rear under load, so a 4” drop in the rear is not generally a problem if the truck looks level. However, some of us believe that returning weight to the front axle is advantageous to good handling with the side benefit of moving weight off the rear axle. Note that if the weight distribution is set up perfectly the front bumper would move up at least 3/16th inch as the truck pivots around the front axle. So, my setup goal has been to raise the front bumper as close to 3/16th inch as possible while making sure that it is no less (which would be more weight added to the front.) As BarneyS hinted Ford often recommends a 50% difference in the height increase of the front. So, if the unhitched height is 16” and the hitched height without WD is 17”, then the goal after WD is setup would be 16.5” according to Ford while my goal has always been to get closer to 16.25”. While the hitch manufacturers suggest measuring the wheel wells to tires, it is WAY easier to measure the center of the front bumper to ground to the nearest 1/16” without moving the truck. If the trailer is not level, the only fix is to reposition the ball mount on the shank purchasing a different length shank if necessary. As the head tilt is adjusted always be sure that the chain slack is adequate for turns. Reese/Drawtite recommends as least 5 chain links. Back in the day I was able to set up our F-150 pulling a 6500 lb. trailer with a 650 lb. ATV in the bed using 800 lb. WD bars.