Hi Dave & Shelly,
To find out for sure, you might have to call Heartland Customer Service at 877-262-8032 / 574-262-8030. Have your VIN # ready.
One thing to note: with three A/C units, Heartland also installs a transfer switch so that power can be switched between the bedroom and the garage A/C units. I don't believe they support running all three at the same time due to power limitations.