I have this one in the RV and it works great. Would never be without it. I just replaced all 5 tires on the RV and needed to adjust the air. No need to find a gas station. Very handy.
http://www.homedepot.com/h_d1/N-5yc1...&storeId=10051
Note: I removed the regulator and put it on a quick connect. When I inflate the tires I plug into the tank unregulated and when I winterize the RV I plug in the regulator and blow out the lines with regulated pressure.