I use Helwig air bags with an onboard Viair compressor on my 99 F250. Changed the regular bed to a flat dump bed, added about 600lbs, needed some help. Also added a 2 gal air tank, so I can inflate tires or use air for whatever I need. Works good to level load, either in the bed or trailers. Since I can raise and lower the rear of the truck, sometimes I can actually hook up to trailers without getting out but once. Rearview camera lets me see and watch the ball into the hitch. Very helpful on unlevel areas. Air bags were bolt on, compressor and tank took some brackets/bolts/welding, but no big deal.