i have used mine in extensive rain without issue.....the water always runs off the front ...which still creates a nice shoe mud station...
i have noticed that my kitchen door does not open to 90 degrees, and BARELY clears the fridge door when i open it.....i thought about trying to adjust it, but left it that way, as i figured it would help with exactly the issue you are talking about...that way even if the trailer was a tiny bit out of level, it would still run foward off the door away from the camper...
i guess you could add on a piece of stick on drip rail?? i think someone else did that with their outside kitchen???
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