The Coleman Mach 8 9200 btu is the unit you are talking about. I got one installed in August, the fan was extremely loud when listened to from the outside of the truck. I discovered on this forum that Airxcel sells a retrofit fan kit that quiets the unit. I ordered it from Camping World and will review it when it gets here.
I hear all the newer ones have the new fan already installed.
Just remember that in very hot conditions, when the interior of your TC is already above 90 it will take some time to cool things down. According to the manual, you can expect these units to cool 15 to 20 degrees below outside ambient temperature. Not a lot when it is over 100 out...