It’s a square collar around the tung with an L shaped bolt underneath. Loosen the bolt and the collar slides forward. This will allow the trailer to pivot where the bolt behind the reflector is. I believe the 2 points sticking up are for a safety chain that is missing. I’ve been told that some trailers are set up to fold the tung for storing in an upright position and not meant to be used as a tilt. Just trying to figure out which one this is. I’ll get more pictures and post them. I really appreciate all of the comments and grateful for any help I get.