My experience with motor homes (severely limited) is the range of models was set up just like GM did when they had Cadillac, Buick, Oldsmobile, Pontiac, and Chevrolet.
Example
1958
Cadillac had power door locks standard
Buick, optional
Oldsmobile, optional on some models
Pontiac, don't even think about it
Chevrolet, no way
1959
Cadillac had power windows standard
Buick, optional power windows, power door locks standard
Oldsmobile, power door locks optional on all models
Pontiac, power door locks optional on some models
Chevrolet, what are power door locks?
1960
Cadillac had power mirrors
Buick, optional power mirrors, power windows and door locks standard
Oldmobile, power door locks standard, power windows optional on all models
Pontiac, power windows optional on some models
Chevrolet, power door locks optional
I don't know the hierarchy between Buick to Chevy, this is just an example.
We looked at several Beavers, and bought the 2005 because many of the nice features that models like Marquis had for a long time had trickled down to the Monterey. The Hydro Hot and the air leveling only were two of the best ones, along with the power bay doors.