I was hoping someone could help me with a small problem I have on my 2005 235S. There is a gap of about an inch to one and a half inch between the back door frame and the camper body. It does let in a fair amount of air. I had put some insulation in the gap but I was wondering if I'd be better off using expaning foam in the gap. Is the gap there for any reason other than heat expansion and cold contraction or was it missed in the final inspection? I purchased the 235S second hand last fall and only noticed the gap this winter. Thanks Bob