I think you are speaking of a lambriquin (sic).....the "window treatment" around the top and sides of the the windows inside the coach. You can see by the sig that we have an Ultimate too but a little newer than yours. The lambriquins in our coach were removed by first removing the day/night shades. Then the material on the sides of the lambriguins is attached by velcro.....the towards the window side. When you have removed that material you will see how to remove the L brackets that I think you are talking about. Good luck.
'02 Ultimate Advantage 40J Spartan MM - Cummins ISC
2013 Jeep Rubicon JK Unlimited