What he said
Cayo brothers are the guys still making parts.
Bargman did do the latches.
Donald Gradeless is the authority on these trailers. You can find him at the Silver Avion Fellowship website.
I have an '87 34X and have towed it thousands and thousands of miles. Just got back from a 2400 mile trip with it. Had a blast. They're a great rig!
Best of luck,