RE: Dometic Cooling
There was a lot of discussion on this very subject about two years ago.  The
concensus at that time was that the Dometic, on propane, would pull temps
down about 40 degrees F below ambient.  Two mods can improve this:  Batter
'fridge fan for better airflow over the cooling fins and second, adding an
exhaust fan to gets the hot air out from behind the refigerator, the hot air
trapped between the back of the 'fridge and the outside wall of the van.
Various degrees of success have been reported with either or both of those
modifications.