Airbag Suspension and Unhitching Question

I would say the first time you hook up, have 5-10 psi in the bags, hook the trailer and see that the pressure is with it on. When unhooking - drop to that pressure (not 5psi) with the weight on. Airbags have a minimum pressure to avoid internal damage from the bag being pinched. 5 psi with a load will be ~2 without.