Question on Air Ride Pin Box - Remote Air Fill

I just installed the 5th Airborne pin box on our Puma and can't be more happy with its performance. I found 85lbs in the air bag is a nice ride.

What is the best product out there to fill the air bag while on the road? I played around with a foot pump and one of those emergency battery powered compressors but they would not fill the air bag under load.

Any suggestions other than going to a gas station and using their air hose?

Thanks.