I have a 2012 Sahara unlimited with 7000 or so miles driven daily around town for work, it has not been off road yet and it has been driven easy so far.
The problem is with the tailgate hinge set up, I was told it is new for 2012 from Chrysler and when the tailgate and spare are opened on an uneven surface or a hill even a small incline the tailgate and tire are to heavy for the plastic arm on the stop mechanism to hold and it can pop free from its mount causing stress on the rear hinges and they can stretch out of position. My dealership has sent pictures of this to Chrysler who denied the problem saying there must have been an outside influence in the cause of this problem.
My dealership is paying for the repair out of there own pocket! they are a great dealership by the way, when my hinge broke I was in my driveway and opened the gate myself holding it until it stopped then let go and it just pulled the stop right out of its connection there was no undue stress just the weight of the tailgate and tire!
so in closing keep an eye on your tailgate hinges and watch for a recall someday as I"m sure this is a weak point.
Thanks for readin my rant...