Were it me....
Unless it is loaded with frost.....I'd leave it be until you finish your trip. Or, if you must....
Just turn the thermostat a little warmer until it begins to melt off. You don't want to open the door and pull everything out and get the fridge hot because it is going to take many hours to re-cool......and refrost itself with the excess moisture you have introduced back into the fridge. Resetting the thermostat slightly higher lets the fridge cycle and warm up enough to melt the frost yet stay cool enough to not require a total recooling exercise.
Also....you need to verify that the condensate catch pan's drain is not clogged with funk and goo. Take a small bottle of water and pour a bit in the catch pan and make sure it quickly drains out. Drain usually empties into the back side of the fridge compartment. But some have a catch bottle in the comparment that traps the runoff. It just evaporates out of the second catch bottle.
If the condensate drain is slow or not working, it may be the cause of your frosting up. Condensate needs to drain out otherwise it recirculates inside the fridge
Another way of looking at these fridges is to think of them as dehumidifiers. Moisture collects on the cold fine and drips into the catch pan and out of the fridge. If moisture can't get away or if you are opening the door lot in high humidity (like right now in Texas!) its going frost up.
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