Pin Box Shock Supressor

I have the TrailAir Tri-Glide, and to be honest, I've never measured the air pressure. They aren't like tires...the bladder requires a different amount of air for each trailer and no two trailers weigh the same on the pin. Even the same trailer will require different air pressures depending on the altitude. Not ever having had a 5th Airborne, I don't know how they set up theirs, but, TrailAir units have an arrow on the shock body and you add or remove air to keep the shock's dust shield at the point of the arrow. I've found the best ride to actually be about 1/4" lower, but, I use the arrow as a reference and not a set psi in the bladder.