Personally, I would leave it in. The less exposure that the slide sidewalls, roof and underside get to the elements, the better. Rain water that runs down the slide end walls tends to wick inward onto the underside membrane (darco material) making it vulnerable to leaks over time.
There are numerous posts regarding water intrusion and subsequent water damage to slide out floors.
I was leaving my slides out on my 2010 fiver and discovered a small leak on the lower drip edge on one of the slide ends. Fortunately, I caught and repaired it quickly and no damage. I now leave them closed when not in use.
Steve
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