Dave,
We have had ours for about 4-5 years, it replaced our 40 Engel single compartment fridge. We have limited space too, old Subaru. We have found that we can run the freezer at max (cold) and the fridge will still stay above freezing, but still cold. Running the freezer at or near max, does put a little bit more load one the battery, but no more then the old Engel on setting 5.
Beigewagon.