I don't remember if it was you who asked about putting a hitch on a Crown bus, if not please pass this on.
I have a hitch installed on my "old Crown". I pulled a small trailer with three flat trackers on it, from the central coast to so Cal multiple times with no problems. My son fabricated the hitch for me. It is attached to the two threaded mounts that were already there. I was told by the Crown guy I think that they were used in the factory to pull the bus chassis around during the manufacturing process. I tried to attach a picture of it but can't here.