I found this blog on Live Work Dream to be very informative. The author describes doing preventative maintenance on your RV siding and roof and goes into great detail, with photos on how to go about this. Apparently Northwood recommends and annual careful inspection and taking prompt action if any problems are spotted. I also have a Northwood RV so this made a considerable impression on me, but obviously most RVers should be doing this anyway. Live Work Dream.
I have to admit that this really was not on my to do list before reading this.