Driving an air ride without air

[Chamberpains]

A fair amount of drive line problems can happen because the shafts are put in extreme angles and then forced to spin. So if you had any ungreased u-joints or rears with low lube levels, running this way will burn them up in a hurry. Being you said he drove with LITTLE or no air and the air compressor kept up allowing him to release the brakes, generally speaking, if he took his time and didn't beat the snot out of it racing back and didn't say he heard the god awful grinding every time he hit a bump, then I would say he didn't hurt anything too bad. Check your drive line real close. U'joints, slip joints and check for excessive yoke movement for pinion shaft bearings getting damaged and check the oil in the rears for metal shavings. 125 miles is a long time to run like that. So hopefully nothing got burnt up for your sake. But I've seen guys run a lot longer than that and had minimal damage.
A quick fix you can teach any driver in that situation is to cut the air supply line off at the junk bag and fold it over to pinch off the air. Then use vise grips, zip tie or any thing that will keep the air from leaking out. this will isolate the bad air bag but allow the others to function. Then you can limp the truck to saftey.