I'm going to do the same thing with my OFF-ROAD POPUP Tent Trailer. The $600 Awning is on its last leg now and no way do I want to spend $600 for a new one... $78 for a 10X8 Portable Canopy from LOWES or Amazon is a big difference from $600.
I think I can add a couple of brackets on the roof side on the patio side and after I crank up the roof I can slip one of those tent canopies into to it and do the same thing... The height will have to clear my trailer entrance door so I may have to do some engineering to make it work... I would want the canopy to be flush with the raised POPUP roof to keep any rain runoff to a different direction instead of pouring down around the entrance door to the trailer.... I'm sure I can add some sort of rain gutter to do this...
Roy Ken