I installed the Draw-tite hitch on a refresh MS. The instructions do not cover the refresh installation, and I didn't like how they did the cutting of the hole anyway, so I was winging that part of it.
The instructions have you cut a huge hole such that the receiver can fit through. This is needed with the Ecohitch to give access to remove the receiver. Since the Draw-tite is a fixed unit, there is no reason to leave the hole, so I modified the installation to just cut a temporary flap to put the big receiver through, then cut a chunk out of the flap and closed it around the shaft of the receiver. No hole is left. As I said, there are no instructions on where to put the hole, so I had to figure that out.
I'll get some pictures later.
The hitch looks ok, but I didn't buy the cargo carrier I intend to use yet, so no real testing on that. My bikes are folding ones, so I will carry them on the cargo carrier folded up, which should cause little or no increased drag.
I have not driven a lot with the hitch installed, but have not bottomed out as yet. I'm sure it will happen eventually...