I've been reading all the frig posts and have been trying to put it all
together.  I'm missing something.  I have an aux battery, frig was
updated, and 2 12v plugs coming off the aux.  the interior light and
radio were rewired to the aux.  Work was completed by Go Westy.  Here
is my take:

1.  Plug the frig into 110 the night before (cool down - prepare for
departure)

2.  Next morning - set frig on propane and light (this is a test only)

3.  Depart on trip - frig is on 12v - aux battery is charging

4.  Break/stop - frig is still on 12v - powered by the aux batt when
the engine is off - aux should power frig for 2-3 hours.

5.  Back on the road - frig on 12v and aux battery is charging

6.  Parked for the night - frig is switched over to propane (which has
40 degree diff)

7.  Aux batt will power interior light, water pump, radio, 2 12v outlets

8  Departure - propane is turned off, frig is switched back to 12v, aug
battery will charge