You haven't updated the trailer in your profile so not sure what year trailer you have. If you have the new Fiamma awning Scamp is putting on sometimes the awning manufacturers make a screen room for their particular awning. Not sure if Fiamma currently has one available for that awning, but a call to Scamp would probably be able to tell you.  UPDATE: Fiamma does show a privacy room on their website that is built to work with their awnings. You'd just have to confirm that it is compatible and available with the awnings Scamp uses. 

http://www.fiammausa.com/products/awnings.asp?Fam=P04

The 4 Corners area (AZ,NM,UT,CO) you are listing visiting in July will have temperatures in excess of 80's to 90+ with surrounding areas of Utah, NM, and AZ in excess of 105+ at that time of year. In addition, that is the monsoon season where the storms can be ferocious with close to hurricane level winds. Last June/July Weather record show considerable storm activity in the area interspersed with nice days which is typical of the monsoon season in the SW. They can hit within a very short time and we never recommend leaving awnings or structures like First Ups unattended or even deployed at that time of year. Not meant to discourage your trip, just be aware of the changing weather in July in the SW. Tons of folks still camp and go at that time and the parks are full, you just have to be aware of how things transpire in the SW in July. 

Personally, I would not recommend going to the expense of a screen room for that particular trip. We aren't bothered by bugs in the SW, and just deploying the awning for some time sitting outside is all we usually need to do down here. When it is 105+ if you can just get out of the direct sun it is usually pleasant enough to sit out under an awning, but you don't want to leave an awning deployed overnight or when you leave camp, especially at that time of year and those locations.