I have not had that issue as of yet, but ours is still fairly new.
Here is what i do with the outside fridge when we are packing up to go home. I turn fridge off and place a towel in the drip pan up top to absorb the defrosting. Once we get home to park it, i prop the door open for storage and remove towel. I have not had any issues with water coming out of fridge, nor has the door come open while in travel.
Kirk, Natalie, 2 Kids & 1 Dog
'14 Ram 2500 4x4 CC w/Cummins
'16 Jayco Eagle 325BHQS
'13 Suntracker PB 22