I installed the Firestone Ride-Rite air springs instead of the Timbren rubber springs for two reasons. First, I don't have my camper on my pickup all the time so I can let most of the air out of the air springs when the camper's off and have a softer ride. The other reason is that you can adjust the left and right air springs independently. This is important to me because my Hawk is much heavier on the driver's side because of the refrigerator, propane tanks, cabinet and water tank.
Ed
Ed,
Thank you for your response. I agree that the air adjustment left to right is an advantage to having air bags. I wonder how great the difference in ride is with the camper on. I understand from what I have read that the timbrens don't come into play without a load on. Of course, if you travel a rough road it seems that they could cause your ride to be a bit bumpy.