In my 11th year of Ollie ownership I doubt that I've used the single awning more than 10 times TOTAL.
Yes, there was one time when I could have used both awnings - if I actually had them, but, certainly that one time is not worth the cost.
For what its worth - I generally camp high in the mountains. Good news is that at elevation (usually above 7500 feet) it always cools way down when the sun goes over the mountains. Bad news is that the wind is very unpredictable in the mountains and I don't want to have that wind damage a fairly expensive "sail".
If there is a fairly good chance that you will spend a fair amount of time in the southwest - think about a lack of trees and a reasonably fierce sun - then I'd suggest giving that second awning serious thought. Or, if you are the type to set up camp and then sit under the awning for considerable periods of time, you might want to consider that second awning. Other than that - spend the money on something that you will use more often.
Bill
p.s. welcome to the Forum and soon to the Family.