Patrick and the others are right, and while I don't know much about RV's, I do understand that the point of not drilling holes in the outer body of your shell would be to at least avoid breaking the waterproof exterior and allowing moisture into the walls which could lead to delamination. I hope you at least applied sealant before adding the screws.
Furthermore, if you are permanently parked and wanted a decorative trim, why not build it fence style, as in drive stakes into the ground and then attach the bamboo to that? I don't see the necessity of physically attaching it to your rig, cuz you're not planning on driving down the road with that hanging on there, right?
Thirdly, if you don't want to take peoples advice, and good advice at that from people with a LOT of XP and know-how, then why did you ask in the first place??? From what I read, it sounds like you just wanted someone to simply nod and say "You bet, go for it!" cuz you had your mind made up from the get go....
Some peoples kids, I swear ;?D