I did all 4.
I was only planning on doing the 2 rear, but after talking to Wyn from Geiser, he convinced me to do all 4. SO GLAD I DID !!!! It sits perfectly level right now with all of my stuff in it. I will be unloading it next week to head to a Texas Raptor Run, I will see how it sits Unloaded.
I was worried about loosing the cushy ride, BUT NOPE, I think it rides as good or better then factory. This truck rides incredible, I'm blown away how smooth it is.
I'm a first time Raptor owner.
LOVE THIS TRUCK !!!