Update: I ordered and installed two 15KBrisk IIs and a CCC2. I now have a system that works perfectly and cools great. Hardest part of installation is getting them on the roof. Luckly I have a barn and a hoist. Did it by myself.
PS: I bought the units and the thermostat from a place called Camper's Paradise in Charlotte, NC. They had the lowest price that I found and I had them within 3 days.
As far as the noise level, they are as quiet or quieter than the Penguins that I had. I like the way the Brisk IIs are built versus the Penguin. They don't depend on the shroud to seal the condenser blower. You can run them with the cover off.