i have an '05 CC LE and bought a used bed extender. love the extender, but my bedliner has indentions where the rubber stoppers sit on it. this is my first experience with spray in liners, but i thought they where supposed to be a little tougher. i live in florida, could it be that the heat from the sun has any bearing on it? do i need to go the wonderful nissan dealer and have them tell me it's all in my head?