If I recall, open the door (fully) stand inside the shower and look for a Phillips screw head on the shower door edge.
By loosening the screw head, the pin can be raised/lowered. That's how they get both pins in (and the door) once the framework is up.
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel-Goodyear Endurance Tires
2017 Ford F-Series SCREW 4x4 - Factory Puck B&W Companion
TST Tire Monitor w/Repeater - Sinemate 3500w Gen.
Days Camped: '17=30 ☼ '18=51 ☼ '19=58 ☼ '20=88