We're having our trailer made that way. The main reason is that it's a decent sized trailer and when we camp in campgrounds we won't have to worry about trying to turn it around to work with the campsite.
For an SUV or smaller trailer, I'd get a bat wing awning probably before I'd buy two.
Curious about this same question. Debating putting (2) Sunseeker Awnings (or ARB2000) on either side of our teardrop to have place to hunker down when buggy or rainy. REally like the Foxwing, but what about mosquitos?!