Follow-Up:
In August we had an A&E Horizon "Box" Awning installed at Camping World. This awning doesn't have the side brackets and opens fairly simply with a crank. One person can do it in about two minutes. The salesman told us that, although the Horizon is distributed by A&E, it's actually made by Fiamma. It is 11' 6" long and cost: $609; the installation cost $49. We used it thre times on trips so far and it is great! Scott