I actually put it on a door I made myself that was 2 inches thick and still manged to get the hardware on with zero problems. I did have to put a 1/2 inch mounting plate on the wall to give myself clearance on my doorway trim but that was to be expected and actually looks quite nice. One small issue I have is my track wheels hit the spacers like speed bumps with a major vibration, see no way this could ever be avoided so assume its designed like this. The holes in the bar should be lower from the top or the wheels smaller.  Worried I am going to need to tighten the mounting bolts up weekly to keep it from vibrating loose.