I installed MaxxAir Fans in my 27QB in the Bedroom, Bathroom and Dinette. Both my wife and I are short, so reaching the manual opening was difficult at best!
So we got the units with the remote controls.
The installations were very simple, and we were able to tackle it in an afternoon.
In the back, the pre-wiring exists in the Bedroom and the Bathroom.
Unfortunately, for the front, the pre-wiring only exists over the cab-over, NOT the dinette. Pretty silly, if you ask me, but that's what it is.
What I wound up doing is taking the wiring from the front vent location and running it back to the dinette using some wire raceways on the ceiling. It was simple, and looks clean.