Sorry about that, that was kinda mean of me.
Ok, so I have a Genesis Technologies as you can see in the photo.
My rig is a 2014 Roo 183 so this is the newest version of this radio with Bluetooth, etc.
To balance the speakers I hit the video/audio button repeatedly until it showed BAL 0 (the button just above my finger in the photo).
Once it was on BAL 0 I hit the volume down button until reaching L5. L5 seemed to be the best setup for my taste. It seems the higher the L number the quieter the interior speakers were set, so L1 is louder inside then L5.
I don't think it matters but when I made my adjustments I had all three zones turned on (A,B and C).
One thing to note, if you use your battery disconnect when closing up the camper for storage all settings are lost.
Sorry for my lack of detail before I blame the hot sun and beer on Sunday afternoon when I figured this out.