I was noticing that Mopar's rear bumper without the tire carrier ad says that it will fit a 35 on the stock tailgate. I have a 33 on the tailgate now and when I shut it the whole Jeep shakes. I have also noticed more noise (squeaking, rattling) from the back after I made the jump from 28s(!) to the 33s. All bolts are tightened to the correct specs. Now, I want to make the jump to 35s. Could I carry that size on the stock tire carrier? Or am I going to have to make an investment in a rear bumper/tire carrier?