Mike, I saw a Phoenix with the side view cameras at the Rally last year. They were mounted on the truck fenders. I thought they looked very cool but wasn't sure how well you could see around the wings of the Phoenix let alone the awning rail. I would think mounting them high on the widest part of the motorhome would make more sense but I really don't know how they work. Does anyone on the forum have them? If so, care to weigh in on how much they help?
I've also seen those "attachment" mirrors for trailers that you hook onto the existing mirror somehow. It sticks out another 6 or 8 inches. While it might look dorky, it could be helpful if you are expecting to be traveling through a lot of traffic. I haven't looked into those yet either, I just saw them in ads.
I would never give up our awning. There have been many times that little shade over the open windows was all that made it bearable (and often quite comfortable) when we are forced to camp in full sun. We love sitting out under the awning enjoying the cooler air in the shade.