If your fridge has an ice maker, then the leak could be in the line that delivers water to that ice maker. A few years ago in our coach, that water line developed a small, 1/4" long crack that sprayed a very small stream at the fridge access door on the outside of the coach. Fortunately, enough water was getting through the door that I could see a few droplets when I walked by the coach. I turned off the water line near the water pump to stop the leaking, then I went to Ace Hardware and purchased a female-female in-line connector, cut out about a 1/2" length of the water line to remove the cracked portion, and installed the connector.
A week or two back there was a discussion about that ice maker water line. It's small, plastic and pretty cheap material... and seems to be prone to cracking. I suspect the cracking could be exacerbated by the heat generated by the fridge's flame when operating on propane.
Regarding our black tank flush water line - it goes from behind its water bay connection point just below the freshwater valve manifold knobs, then up and over the fore waste tank. Our fridge is several feet forward of the water bay door.