Good question, and probably a common issue. I'm assuming you have the Dometic CCC2 LCD thermostat. I also have the issue with thermostat being several degrees apart. The reason is that there are 2 sensors, one is in the actual thermostat, the other is on a wall behind a quarter-sized slotted black plastic cover. On my 2018 25 FBT, the second sensor is near the fridge behind the TV. It picks up heat from the fridge so it's always a couple degrees higher. I just set the temperatures separately in the 2 zones so they turn on and off at roughly the same time. Furnace just uses the one sensor, so I just adjust it to actual comfort.
I looked up the service manual out of curiosity, there's no calibration mode or any way to compensate for the temperature difference.
If just setting zone 1 and 2 to different temps doesn't work for you, I guess you could investigate physically moving the zone 2 sensor or coming up with a way to thermally isolate it.
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