Was driving on the PA turnpike yesterday when my tire light came on and boom, down to rim. It was scary as I was crossing a bridge with no room to pull over, but eventually made it to the shoulder on other side. The road was smooth and truck had 3500 miles, Inside of the tire wall has a 4" tear.
On your knob to engage 4WD, there is a button in center of knob that turns on the wheel lock, which I believe is used in 4WD mode at times. If engaged, you will see a chassis type icon on your instrument panel in orange.
I heard back from Tuffskinz and it sounds like they sent me the wrong smaller letters and are sending out the larger letters, so will see how they fit. Makes sense as I sent them some measurements and the letters they sent were not even close. Will keep you posted.