Steve, our 84 310 motorhome also uses the airbags. I'm not sure how many miles we drove with one side deflated but probably quite a few. I didn't really notice much difference in the ride after I inflated it but not to long later I found that it had a leak. Our last trip to Branson I deflated the other side so we could make the trip. Other than a little rougher feeling through the steering wheel I didn't notice much else. I do know however that it will impact your front end alignment and your tires will probably start wearing more. I definitely plan on replacing both of ours before our next trip.
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)