Would there be any other mechanical factor that would cause the rear end to sag lower on the driver side besides a weak or broken coil spring or malfunctioning air ride? My air ride works like a charm, and the shocks are brand new, and I checked the coil spring but see no signs of cracks or fractures so it must be weak. I'm looking to order a new one from the UK at $47. I know, I know it's best to order them in pairs but I don't have the money for that right now. I just want to level out the rear end before my 2 week cross country roadtrip vacation to the Carolinas. Any tips with this would be much appreciated.

Thank You!