Most hitch manufactures recommend that the hitch not be used for the reasons stated by aav6h.
I just uploaded a picture of my method, entitled "5th wheel break away cable hook" in the photos, upgrades section. I will attempt to add it to this post when it is approved.
I also Installed this to make it easier to hook up the umbilical cord. Both are now readily accessible with no more standing on tiptoes or crawling under and around to hook up.
The parts are available at most RV repair departments and are clearly marked for easy assembly.