We have the two-track system on nearly a full length slide out with kitchen sink, refrigerator, range, drawers, cabinets, bed and under bed storage, and pantry. No problems so far, but the slide only extends about eighteen inches. It's important to make sure that the coach is level and on the jacks. But when we had a problem with the jacks, I chose to deploy the slide out without using the jacks. I parked the RV with the slide out side a bit high to compensate for settlement of the suspension on the slide out side. No problem, but I only did that once or twice.
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