I have a long slide, about 14 foot long. It is more than half the length of the 23 ft. TT box.
It is only 17 inches deep but it contains the kitchen sink, stove, oven, silverware/under sink storage cabinets, overhead storage, microwave and couch/bed. It is in rack and pinion slide.
It gets no special treatment and is used in or out. It does not block anything when retracted, keeping the TT fully functional.
I would not own a TT without a slide or with a slide that had to be extended before the TT was fully functional.
So as you can see all slides are not created equal.
Safe Travels.