I have been thinking about this.. I'm going to hazard a guess...
The fridge is a Dometic isn't it...
I am tempted, seriously tempted, to save the rest of this for tomorrow but.. I will not put you through the anguish
One of the differences between Dometic and Norcold is how they handle condensation (the water that drips off the fins)
Norcold runs it outside into a cup, where hopefully waste heat from the heaters evaporates it,, I can imagine in very high mositure conditions (VERY HUMID) it might overflow but I've never read of it happening.
Dometic just runs the tube out, it is **SUPPPOSED** to be extended out one of the holes in the cover so it can drip on the ground but when I got my coach new it was not so routed. When they did the Dometic recall I mentioned it to them and the tech, handing the keys to the service consultant, said "I always put it out through the vent hole" Guess what.. He did not.
And that's where the water is coming from.
Route the black ribbed hose with the thingy in the end through a vent hole and watch that water drip down noto the ground.