Thanks for reply. Yes, I expected that was the case. It seems that the two cable connections add pressure to the rotted wood as that is where the bowing out is most obvious.
First, everything is working fine. At what point is it necessary to do this work. Is it necessary at all as it has been the same for 1-2 years.
Second, is it easier to remove outer or inner covering? Does entire top need to come off or can the covering be removed with top supported and cables detached.
I thought I saw somewhere that 2002 Towlite had aluminum framing.