I have an older Reese trunnion that I cannot get the washers with teeth to keep the ball tilt at the angle I want.
I am using 2 of the washers with teeth on each side of the trunnion and am torquing to 300 lbs, both the top bolt and the bottom bolt. With the tilt the way I want it, the coupler is about 1 inch from the shank (not shown).
But within moments of pulling the Airstream, the ball has slipped and tilted back up, the washers have slipped, and the coupler is once again touching the shank. (see photos)
I suspect it is a combination of the trunnion is worn out where the slots on the washers are supposed to connect, along with the pressure the trunnion bars place on the top bolt and washers.
Take a pic of the face of the trunnion and ball mount from the rear (between the spring bars. It appears to me you are missing the tilt pin, washers and tightening bolt for the tilt adjustment. They are what hold the head in the proper position, not the bolts themselves.
"If the women don't find you handsome, they should at least find you handy." - Red Green
I had the same problem one time and fixed it by making a shim out of flat stock steel. I took a piece of steel the width of the opening between the ball mount and body and put a bend in it facing the ball so it would not slip down when slid into place. That did the trick. You have a tremendous amount of torque pushing in on the mount for bolts and washers to hold alone.
Hope this helps...