We had bags on our last RV. The ones located inside of the front coil springs had air valves like an innertube would have, and could be checked up under the hood compartment where you could check batteries, washer fluid, etc... The owners manual had a recommended pressure for them. Front bags were manual fill, rear bags were feed through a control unit that kept the RV level all the time.
Yours are probably easy to trace if you crawl under yor RV and take a look.
Me, my wife & our son.
2014 Jayco Redhawk 26xs bought new in April 2014.
Camping, Fishing, Blue Grass, Video & Computer Games