Bapos, thanks for your replies, but I was wanting to know what was typical for an RV or bus, not a technical write up. A stereo can be rated for something but a certain type of vehicle won't need to utilize the stereo's maximum rated output or every channel available. I was thinking an RV might be different than a typical car set up because of all the open space and the different acoustic environment, plus the passengers in an RV wouldn't have the same seating configuration as a passenger car. Maybe one speaker for the driver, one speaker for the front passenger, and one or two more for the rear plus a possible sub?
Again, I wasn't looking for the technical specifications of a typical stereo (I can look that up), I was looking for more general information like what is the typical speaker configuration of a class A motorhome.