I'm pretty sure that awning would be wider than most any teardrop out there. I personally use a Bus Depot ez awning that I attach to my roof rack to go over my galley. Many people use a free standing awning or one of those SUV rear awnings or tents. I have not seen someone do a permanently attached awning for the rear galley.
Like @ottsville said....I have the Foxwing with a full wall set, on the left hand side , and an ARB 2500 on the right over the kitchen area. The Foxing provides a dressing/shower area or a dry hangout area in adverse weather.
From this angle you can see the "doorway" to enter the Foxwing
I've seen these type in action...and believe this is the most viable for a rear access galley kitchen. The fellow that parked next to me had one over his teardrop kitchen...very cool!