Slide Problems
The problem with most slides is that they were installed incorrectly at the factory, and not adjusted.
THOR's QA department consists of buyers returning to the selling dealers for repair/replacement of incorrectly installed or defective parts. It helps them work off that 1 year warranty with your coach sitting in a shop, waiting for repairs.
I believe you will find that the lower rollers, that support the weight of the slide, were never shimmed up properly, to meet and support the slide. Very common problem. The rollers must be removed, shimmed up to support the weight of the slide.
Welcome to THOR Warranty Service. You will get to know them well.
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