Originally the pins (with knurled ends) were just pressed into the hinge body. Mine were not maintained in the 11 years before I bought it and the hinge bodies were wallowed out. I tried to peen them in, but it didn't hold. The pins on the new trailers have a groove in them and once put in place a c-clip is driven in between the top hinge block and the block on the door and captures the groove in the pin. New pins are about $10 each. I just ordered some but haven't installed them yet.
"You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO
2002 Classic 30 Slideout
2001 Safari 25 RB Twin (Gone, but not forgotten)
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
WBCCI 1322, TAC FL-39, AIR 82265