drenjoey - You are saying the RV RAIN GUTTER got damaged by a limb. WOW.. Thats amazing... I'd love to see a picture of how that happened. What i get for thinking I guess... Figured you was talking about the rain gutter extension add-ons... Disregard all about those I reckon...
I would just go to LOWES and see what they have in stock. Maybe just a right angle aluminum strip would work. LOWES may also have some U-size strips as well. Anything like that to divert the runoff off the the sides.
I mounted (glued down with DICOR Only) a plain ole angle strips across the back roof of my fifth wheel where water was running down onto the rear windows causing black streaks every time it rains. The Angle strip diverts the water to 5th wheel rain gutter running down both sides of the trailer.
Try to keep things simple around here haha...
Roy Ken