08 F250 SRW. Without airbags the rear sagged (photo in signature is pre-airbags) and when we towed our 14.5K lb Monty down the highway, we would get an up/down wave effect after dips in the road. Added airbags, now, with 65lbs in the bags, the truck is level and rides like a dream, no more wave effect. I sometimes forget the Monty is behind us. I added the airbags only, no compressor due to cost. I did however extend the airbag fill port up along the inside of the bed to sidewall at the left rear corner. Then I just use a portable compressor to fill the bags.
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