We experienced the same banging noises in a 40 MPH cross wind while driving eastbound on I-80 from Wendover, Nevada to Salt Lake City, Utah last year. All of our slide-outs have Dometic A&E "slide-topper" awnings. These awnings have anti-billowing devices that keep the awning from unrolling itself during high cross wind conditions. There is a little arm fastened to the end of the roller that stores the slide-topper awning. This arm turns inward towards the MH when the wind causes the awning fabric to billow. The arm has a small metal landing plate on mounted on the MH. When the cross wind is strong enough to cause the slide-topper awning to billow, the small arm moves inward and hits the metal plate on the MH. This is what caused the "banging noises" on our 2013 FR 3011 MH. I was told by the MH dealer that this banging noise is normal during high cross winds. Google "Dometic A&E anti-billowing device" for pictures of the metal arm.