Dan,

Just an observation here.......if you are at a Flying J and you need air it means your bus has been running and your aux pressure has been provided by your engine to the tune of about 125 to 130 PSI.

Personally, I wouldn't want to use an air hose or chuck from any truck stop.

You should add a quick release fitting in your steer compartment and one in the RH rear at the air fill fitting and use a 50 foot small diameter air hose. If you need air in your tires that will work fine.

A few minutes of running of your coach and you have all the air pressure you need to fill any tire.