Were you able to get the roller replaced? We had an issue where the small slide was tilted to one side. It turns out the bracket is a slotted flat plate bolted to the wall with "arms" at about a 45 degree angle. The roller is in between the arms, The flat plate began bending. I put the slide most of the way out so I was able to reach the bracket, and used a floor jack from the inside, a few inches allowed me to remove the two screws holding the bracket and fix it in the garage. I mig welded additional bracing and we are good, Just use a piece of plywood to spread out the surface area of the jack.
2008 Rockwood 8318
GMC 3500 Crew Cab Dually Diesel