Added a Rebel Snugtop shell and Truckvault to my 2012 FX4 Screw ECOBOOST. Total weight is approximately 500 lbs. Planning on bringing the rear end back to factory height and then leveling the truck. At this point adding an airbag assist (Ride Rite) to the rear and the adjustable Bilsteins to the front seems like the best solution. Would love to know what others have done. Thanks