I threw our 2 year old Dometic as off the roof and replaced it with a Atwood for a few reasons. First the Dometic would just not run reliably on a 4k generator and thats with all the gizmos added on and the local Yamaha factory dealer going through the generator and saying there is nothing wrong with it. The AC also on occasion would trip my house breaker when plugged in. Also it was incredibly noisy when running and the amout of cold air it did put out never really reached very far in the trailer.
The Atwood is magnitudes quieter, runs off of 2k watts if needed and throws a stiff ice cold breeze 15-20'. It was basic to install, 4 clamp screws and three wires. Worth every penny.