beating a dead horse. (towing with air-bags)

[emagdnim101]

Im new to this forum and to this type of truck. I have a 79 c-10 i bought as a project. I put the lowering kit 4/6 on the truck and built the engine yada yada yada. I am interested in throwing the truck on bags and throwing a 4link out back. My question is what airbag suspension/4link systems do ya'll recommend. What is most economical ? I am open to any tips and suggestions and appreciate everyone who takes the time to read and respond. Great forum btw.