Our pop up has a bit of a sag near the AC unit which is causing water to pool and leak into the roof. So I am looking for solutions short of replacing the entire roof. flatroofsolutions.com sells a white on black EPDM rubber membrane roofing specifically for this application. I would have to build up the area around the AC unit somewhat and then apply the membrane across the entire roof. Does anyone know anything about this company or this technology? Or should we be looking at other options? Do you have any ideas on what might be good ways to build up the are around the AC unit? I can't find anyone around our area (North Carolina) who does roof replacement, so this seems like the next option. Thanks all!