Rear bedroom is the 13.5k with heat pump - part number 641835CXX1C0
Front / midship is your 15k AC/heat pump part number 651816CXX1C0
Regarding solar panel location, well, you have lots of options on where to place your third panel if you want to fix to the roof. I have 8 100w panels up top of my 30’ international. Picture attached regarding optimal placement of panels...
Others choose to expand their systems using portable panels with separate charge controller, which are setup on the ground, and connected via the Zamp connector at your front battery box.