I considered the Air Lift 5k on my recent rear F350 dually suspension upgrade, but dont like the fact that your essentially removing weight from the springs when you inflate the bags. I chose instead to add the Timbren joust bumpers to help handle the extra down force on a heavier 5er. To each his own I suppose. If you add air bags, protect the air lines with fuel hose and teflon tape on all fittings.
2017 F350 Dually 6.7
He who dies with the most tools, wins!