I had this problem as well, pin broke. The original was a 1/4"coil pin, so was stronger than a 1/4" roll pin, but still broke. I decided to always use a bolt and nut. After returning home replace it with a grade 8 1/4" bolt (Allen head) and lock nut. With no pin I could move the slide by hand so it appeared nothing was binding and confirmed the rear slide was on rollers.
Ellen & Greg
08 National Dolphin DL-35Ci, RoadMaster Rear Sway Bar, Rear Trac Bar, Koni Shocks Front,
Workhorse W22, Kelderman Air Ride, Towing 2016 Smart Car