[blown240]

I have always had a good experience with firestone and Slam Specialties bags. If you just want a load helper you can do a simple air setup with a compressor and a single electric valve. It won't fill fast, but basically with 1 three posisition switch you can control it.

I believe the large Firestone bags are good for 2600 lbs.

The switch in the center will be off, up will turn on the compressor, and down will open the valve to release the air.