Removing flat trim on bed?

[denverslim]

I'm working on removing the flat stainless trim to peck out the dents in deformations from over the years in a tight garage. The cab and forward have nuts that I can access (although not easily) but there is no way to get to the back of the trim on the bed because of the inner sheet metal. How would I go about removing this stuff without stretching or damaging it?
Body man, I am not, however I can handle the dents in this SS.
Thank you all in advance.