We used flashing, copper piping, caulking, Epoxy, rivets, white spray paint.
We used the above list because thats what we had in the house but of course you could use a dozen other materials....we just bent the flashing to make a "gutter"... made a hole for the copper piping, epoxied it, bent the ends closed and riveted them. We then drilled holes into the flashing on an angle so the water flows out faster, backed out the screws in the AC..screwed the "gutter" on...caulked it up and it works PERFECTLY! Im not sure why Jayco didnt do this.
Note it is "crooked" so the water drains quickly towards the "spout"
I have additional photos if you need them.