No more vertical freezers for me. Ever. Zip.
I once performed a temperature gain test on a vertical freezer. Opening the door twice for 10-seconds each event equaled, opening a chest freezer door 14-times at 25 seconds (I had to vary the event-timing to make the comparisons equivalent).
Yeah I know about the "won't fit - wasted space" quandary in an RV. But I overlaid insulation on the freezer. 2" everywhere except where I had to shoot foam. The freezer maintains a reliable -11F. The girls love ice-cream but screaming occurs when the cold induces a sinus headache. The refrigerator with circulation fans (2) maintains 36F. A sopping wet towel with chlorine bleach drops added draped over top the vegetables in the bin keeps lettuce and celery snapping fresh for many days.
-11F ice cubes snap and pop when liquid is poured over them. I keep thick glass mugs in the freezer and man oh man lemonade and iced tea burns all the way down.