Tightened body to frame bolts on '11 April 29, 2015, 01:37:13 am Yahoo Message Number: 152482Highly recommend you check them (if you haven't) and give them a snugging. I have an '11 first sold in '12 currently at 13K miles. Went around underneath with 9/16 deep socket most of the nuts required half to 3/4 turn. None were in danger of falling off. Some were hidden under tanks but accessible. It seems to tighten up the harmonics in the coach when traveling at 60 plus MPH. Seems to have less boom or rumble at speed.Just a few minute job,