Warren,

I love my air doubler (sounds like the we have the same unit). It allows me to fine tune my tire pressure no matter where I am. I have also used it to air up my toad tire once when it developed a slow leak; and rather than change it on the side of the road (dangerous) I was able to limp in to a town with a tire service and have them fix it.

I had mentioned this device on a previous thread, but it didn't get much interest. Someone said that you could adjust the diesel engine's air compressor up so that it would air up a tire. That sounds like the least expensive way to do it, but since I have the "air doubler" I just use it.