Follow up
Okay, I removed all the rotted wood and it was only that 1"x 1.5" cross piece between the floor of the refrigerator plumbing/hardware and the outside of the camper shell. There is no rot below at all. I replaced the rotted wood and now I'm trying find where the condensate drain went after it enters the box. The drain is there, it's just broken/dried out. Here is a picture of the drain.
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