I usually wait till I get stuck till I air down. Then 18-20# only in the truck, seems to work perfect and rig just pulls right out.
I've never air'd down the TH, and have gotten unstuck in some pretty deep sand in the washes at Glamis just airing down the truck.
Just don't get stuck and keep digging down.
Once you know you're not moving, and or starting to dig in bunny hop, STOP and air down. Don't do what I've seen many do, and bury your axle in the sand. Then you will have to dig it out and air down and maybe need a tow out.
jmo