Dave H M wrote:
How does that work out when you're parked on an incline or decline when hooking up? You would be better served using a tape measure and measuring the fender back to unloaded ride height...
JS I think we are getting a little whatever here. Through many hook ups I know what air pressure to put in the air bags with the truck unloaded. I back up to the barn, air up the bags to 25 and hook up whenever, the loaded height will be right.
There is a difference between using a fixed PSI that you know works for your load, and using a level. One of those is going to get you in the ballpark, and one is going to be highly inaccurate. The proper way to air up bags is to use a measuring tape to return the fenders to unloaded ride height, or, once you know how many pressure that takes, air up to that PSI. It doesn't make any sense to try to make anything on top of a truck level if the ground under it is not (which is almost always the case, whether you notice it or not.)