I had same problem with my Jayco. I found the name of the shower door manufacturer on the door. I called them and they were able to get me new rollers. I did see some rollers at RV store after repair was made.
Take the unit and a car to an RV park or campground close to your home. Live in it for a few days (cook, use bathroom, dump, fill water, wash dishes, check the frig, furnace and AC. If there is a problem or forgot something you're near home.
Settle in for a few days - enjoy and learn.
Welcome to RVing