So, here's our latest attempt at a remedy: Today we pulled out the recently installed flocking, attached 3/16 inch Sponge Window Seal Air-Sealing Tape to the underside of the flocking, and reinstalled it. This should snug up the window in the channel. The real test will come when next we take it on the road. Our's, as well, is a 2013 ACE 30.1, and while both the driver's and passenger's windows rattle, the driver's side window is the worst.
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