Gary:
If you have water standing on the top of the slide when you crank it in, I am not surprised that it spills on the carpet. If your seals are like mine, there isn't a way to guarantee water being pushed to the outside of the unit when you bring it back inside. actually, I suspect that it goes in the pan and through the corner of the pan (which is welded, but not sealed), or maybe just wicks down along the inner seal when you are cranking it in. Does it leak when you have it out all the way? Mine was leaking also, but adjusting the seals, then replacing them fixed that. Good luck on your repairs. You may have to reconcile to wiping down the top of the slide before bringing it in (which is fun if it is raining when you do it in the first place).