Years ago (early 90's) we had a Rockwood Tent Trailer where the tent end slid off the tracks. It was my son's job to slide out the "tents". He caught 'it' when it failed. Been a while, but I think the little guy along with Dad figured out what had to be tightened up and fixed it themselves. So many months/years since then and none of them remember what they did! We were lucky other than that we didn't have warranty issues.
What really sucks with your issue is that often when you purchase an rv with a particular dealer, and you have an issue, they usually make you a priority. Perhaps you can ask them about this (maybe you won't buy from them again?). Sabina, Good luck and hope all goes well