I have a 2003 Monaco Signature that has a 42" Plasma TV mid coach in the main slide beside a couch & above a cabinet. I need to replace the unit & I can not figure out how the TV was installed initially. It's in an angled cabinet that is on top of the cabinet countertop. I can see the 2 angle iron vertical supports that the TV is attached to but I don't know how it was assembled. Has anyone out there had to get into one of these before?