I put my superslide out when it is in storage, as it makes it easier to do stuff inside, and I do put supports under the slide. It probably isn't necessary, but it can't hurt either. But I also have the whole camper up on jack stands, so it is very solid.
If the camper is just sitting on its tires and the camper jacks, it can bounce around a bit. If the slide is blocked up, then it will move around a bit as the camper moves, but shouldn't be any big concern.
Having said that, the slide shouldn't need any support. They aren't built very well, but they are supposedly designed for it. (famous last words!)
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