I have a 2013 XLT 4x4 that I've owned since new. One thing I had noticed was that the vehicle would easily run out of rebound travel while driving through intersections at city speeds. It was incredibly harsh. I'm not sure if Ford intentionally limited rebound to keep driveshaft angles low. Well eventually the seal on one of the shocks blew, probably from slamming into rebound. I installed some Bilstein B6 shocks. I noticed that the socks are about 2 inches longer at full rebound than the OEM shocks. As a result there are no more problems with running out of rebound travel. The ride is quite nice. Only downside is that at full droop the rear brake hoses are a bit tight from being stretched. I will probably change all of the rubber hoses for stainless braided hoses at some point.