Not sure if its the same, but on my 97 F53 I had the same issue. After crawing around under the dash and under the bottom of the camper I found the "frame" that holds the steering wheel and pedals and such has bolts to hold it to the "body" of the camper. All of the bolts had rattled out. After installing new bolts thru the firewall the rattle was gone. I would hope a 2011 woudn't have this issue, but its worth looking.
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2003 Winnebago Adventurer 35U
2009 JK
2020 JT
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