 Watch out for the seat heaters!  They go out after a few years. Don't put a sticker inside on the rear window. It takes off the rear window defrost and won't work again. Don't get the dual zone climate control. If the drivers side quits, you have to take out the entire dash to fix the blend air valve!  Watch this truck for leaks!  Loves to leak around the sunroof and upper rear brake light above the rear window. Speaking of sunroof, you had better us it about once per week, or NOT AT ALL.  The track dries out, and if you try to open it you will break the track!  Which the parts aren't expensive, it's all the labor!  They Goodyear tires that came on my FX4 were terrible!  I think I got 32,000 miles out of the set. Not what I was expecting.