Came across this podcast where in part explains what part of the RV fridge needs to be level and why. I always thought it had to do with the boiler and found it has to do with the Absorber/Evaporator orientation.
I'm not endorsing any product discussed on this podcast and only offer up for those that might find helpful as I did.
Beware video is a bit choppy and should view with good Wifi connection.
Sorry if this has been posted before a Google search did not reveal this video being discussed before.