I am replacing the 20+ year old carpet in my bounder, pulled the carpet up on side there is a cut piece of angle iron bolted to floor next to passenger side wall 10', nothing on other side. trying to figure out if this is factory or did someone in the past bolt it there. being bolted to the floor only it doesn't seem to be a frame piece or a wall support. any ideas? I'm putting vinyl planking down an will have to get creative.