Good information. I also failed to make center hub to fender measurements on my 2013 TRD 4x4. Than I added an ARB deluxe front bumper and Warn M8000 winch. Big time front sag expected and it was so. Per ARB suggestion, I replaced the OEM front coils and Bilstein shocks with OME 886 springs and OME Nitrocharger N240 shocks. Front measurement fender to mid hub 23 inches. Rear 21.5 and I could see the sag. Installed ICON
3 leaf Add a Leaf in the rear. Now I'm 23.5 rear and 23.25 front. ICON claims a 1.5 inch lift and they were right on for me. Rides fine, couldn't be happier. No kangaroos in Montana, but plenty of deer. I don't see a difference in measurement drivers to passengers sides. Before the suspension changes I had a Taco lean to the drivers side of 1/2 inch.