You aren't hurting anything leaving the bags deflated. I once left our Foretravel sitting for two years with the bags empty. When we started using the coach again, the bags were fine. The tires and 200 gals. of diesel were good to go as well. I had dumped in a couple of gallons of Howes Diesel Treatment in the tank after I realized the coach was going to be in one spot for such an extended period of time. How come you guys built bus barns with low clearance??