We are going out on a weekend camping trip this weekend....While getting the camper ready, I tried hammering the staples back in, but they had pushed through the trim. I ended up getting my staple gun, with longer staples, and putting about 20 staples along the back trim and then along the support bar, along the side (just under the fridge).
This took care of the bowing issue, except at the very bottom where I can't get my staple gun or hammer.
Thanks for the replies!!