ours is the 2014 1/2 'late' model, with three trax, which is why I purchased it over the two trax sitting next to it at MHSRV in Texas.
I will say this, tho, I really don't think that it's the 'number' of slides that solves any issue. I believe that it's 'how' the box/slide is manufactured, and whether it is 'square' enough to slide with no issues. The motors also can give way, and have to be replaced, but that is truly minor to issues such as yours.
Yes, we had the main slide rear column/gear/assembly replaced at Wakarusa, IN.(Thor's motorized coach factory service center facility) back in early '16, and have had zero instances since then, probably 50,000 miles later and many, many hundreds of in/outs of the slide.
I would suggest that your issue is related more to a 'out of square' slide box than anything else. That's probably something any dealer can do much of nothing about.
The factory service center is, to me personally, the ONLY place to resolve these issues.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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