I installed one in my class C, and transferred it to my then new Class A 16 years ago! They still all work. I installed two more, one with a rain sensor. I like the rain sensor one the least, as it has a super noisy motor to open it, and it will close automatically if the humidity is really high, or if some rain gets under the Maxx air cover, and onto the rain sensor.
I usually leave the fan in the bathroom on 'auto' and set the thermostat for about 80F, so it will vent the RV and keep the dogs cool.
In the bedroom, I installed a really simple one, without thermostat, and it works great too!
Fleetwood provided power to each roof vent location, only the bathroom had a power vent factory installed, that was about useless.
Have fun camping!
Fred.