Some 40 makers are using the Schwintek slide drive. See:
In-Wall® Slide-Out
For what ever reason, these 2 track per side drives have a high failure rate on the large slides. See any of many threads here like:
http://www.irv2.com/forums/f121/full...ng-264134.html
TMC is well aware of this issue...even going to the 3Trax during the model year 2015 for most big slides. See:
https://thormotorcoach.com/3TRAX/
I recommend a call directly to TMC Customer Service and to keep a constant dialog with the factory. See:
https://thormotorcoach.com/contact/
There are too many stories here where an owner was told the factory was being no help, but the problem was the dealer cutting corners or worse, trying to slime out of making repairs needed...this since waranty repairs are not paid at retail rates
Best luck