Leah, as Bill explained, it isn't as easy as it sounds. I bought a bunch of hose and fittings too, but discovered that the tank pressure dropped below my target tire pressure before the system called for repressurizing the tanks, just as Bill points out. It can be done, but using a portable pump seems easier all around.
Dave, like my rig, that battery bay outlet is the only one I know of. The hassle with that location is if you ever have to be towed, the poor tow truck operator has to run a long hose from his truck all the way back to that spigot (to control the coach's air volume and parking brakes). Been there, done that. Trying to find stuff on the passenger side to drape the hose from and hold it secure required creativity, and time. And the hose can rub marks on the sidewall and other parts during the trip. Most outlets are up front in the generator compartment, which makes sense. Why the heck they stuck ours in the back, I don't know. I assume it may have made for an easier splice for a toad brake air line, but I don't know.
I imagine a guy could run a line up and put an outlet in up front, but the more fittings we have the more chances for system leaks.
Joel
