WEIGHT DIST HITCH

beemerphile, There is no requirement but you seem to be misinformed. Let yours sag. I have a 2006 Chevy 2500hd and usually leave grossed at about 19500. GVWR for my truck is 22,500. I have Airlift on the rear and Firestone 1003 airshocks on the front and a Reese Dual Cam. It sets perfectly level.Take your truck to a lot that is level and adjust your hitch. I agree with HVAC, it takes a trip but start by trying to get the truck level before you leave. Measure the distance between the top of the front wheel and the fender before hooking on. What you should be trying for is to get it to the same height and have front a rear level. When you get it level, you may get a rough ride but it should handle well in the wind and when a truck passes you, very little sway. If it sags in the rear you can get sway from passing trucks and it causes added wear on the front tires. With thousands of videos on the subject you should be successful. Good luck.