Judy with all of the pertinent info on your coach needed to help find that bedroom compressor not included in your signature I can tell you without a doubt it is in the basement
Look at the exhaust openings under the bus for the 2 a/c's up front behind the bumper then search for the same thing elsewhere under the bays.
Again not knowing whether you have 3 or 4 would also help to help you.
If you find 2 similar additional openings under the bus turn the unit on and off the blower will be the giveaway.
I'm assuming it is completly behind a panel since you can not see it, half a dozen screws usually pretty easy.
I can say for sure that the bedroom unit will not be either of the 2 behind the front bumper.