When we are done our trip we leave our fridge and freezer wide open. If the trip was more than a few days and there is a bit of ice on the back of the freezer I will leave a small dry towel in the freezer to catch the run off. Been doing for years with no issue.
We have many sets of the little fridge pop thingys (it is a running joke that we buy a new rig just to get them), but I never use em. Not sure why, just never got into the habit.
2015 F-350 SRW 6.7 PSD
2014 Crusader 295RST
1 Fantastic DW
1 Amazing DD
1 Beagle that will be missed (RIP Zeus)