I'm not a big fan of powered awnings having had two unpowered ones come unrolled or torn from the coach, neither of which is fun. When a sudden wind comes up the retraction time on a powered awning just exposes the awning and coach to the risk of damage. But if I were to have an awning cantilevered off the side/top of the coach I would insist on having the structural support external. If an installation relies on internal backing plates or through bolts and there is no easy way to access that structure to retighten it or repair it I can envision some serious expenses potentially being incurred.

If Gary wants a retrofit, it seems a structure that goes across the entire roof would easily replace internal members located essentially at the top corner. That crosswise structure can be installed onto the coach roof support ribs and in lieu of sheet metal screws devices such as rivnuts can provide secure threaded fastening. It just requires someone to create the appropriate support framework. The decorative cover would keep the structural part out of sight. It bothers me when a converter does not consider future modifications and repairs and Ben is right about a Liberty ceiling. It would be cheaper to buy a new coach than to try to remove and replace one. I found that out while trying to jam a new refrigerator into an opening that was too small and the ceiling was secured to the top fascia. The fascia had to be cut in place, attached to the ceiling because there was no way of removing it short of removing the ceiling, something I was told I did not want to do.