Air Leak

Check valve in the dryer.

 

Once all your bags are inflated, jack the truck up to extend the bags, and spray them down. Could be leaking between the bag and the base.

 

Check fan clutch. Engine off, key on you might be able to hear it. Some engines apparently use air for the turbo actuator as well.

 

I would say the compressor is having trouble keeping up with the leak in the steer axle suspension. There’s a leak there somewhere if it drops overnight. On the road the compressor has to keep up with the leak as well as whatever the ride height adjuster calls for on the road. God prefers Diesels sent you on the right trail. You already know which axle needs checking.

 

If bags are deflated it's a giveaway that one or more of air bags are leaking. Check air dryer as well as mentioned above

 

Compressor runs about every ten minutes while running down the road? Sounds completely normal to me. I don't worry about slow leaks overnight. They come and go. I don't spend time chasing them down if I can't hear them audibly walking around the truck.

 

I’m exactly opposite. I’m the loon you see under his truck with a spray bottle of soapy water and a handful of wrenches. I can park overnight with a loaded b-train and if it’s not windy enough to bounce the truck around a lot my low air alarm doesn’t come on when I start the truck in the morning.

 

You need an ultrasonic leak detector.

I just bought one.

I'm going to make my truck so that I can shut it down and go on vacation and when I come back my tanks will still be full, lol.

I have not tried it yet but I will over the weekend. I'm curious to see how it works and what I find.