I needed to back my trailer onto an asphalt pad that was slightly higher than the road I came from. This caused a peak where the pad and road met. To keep the rear bumper of my trailer from rubbing the peak, I let air out of my bags to allow the rear trailer bumper to lift. As the front of the trailer neared the peak, I added air to the bags to lift the front of the trailer over the peak. I think I sold 3 more of these units to the guys watching me do this. Worked amazingly. Would have been a pain doing this manually (without the remote-controlled compressor).