I have rigged down during rain.  (yuck)  The slide seals on the sides seem to squeegee the water off the sides of the slide.  Water on top of the slide has never been an issue, the slide toppers seem to keep them dry.  I guess in a blowing ran, there would be some water, but our slide seems to tilt as it comes in, so most if not all the water would drain off the top.

Never been an issue.

Although we try not to travel in the rain, we have done it and the slides being wet hasn't been a problem. We don't have slide toppers either.

When I had slide toppers (they have since ripped and blown away) if you didn't get the pools off of them they would run down the sides of the slide and get the carpets wet. Now (without toppers) water on the top of the slide only gets partially squeegied off by the slide seals and the rest remains on top of the slide inside the trailer. Some of the water will run down on to the carpet when moving. The bottom line is that in my experience pulling the slides in when wet will get some water inside. Not great. I always try to remove as much water as I can before moving the slides in but if its raining you can't get it all.

Unfortunately we have had to move a few times when it has been raining or wet outside. The sides seem to come in ok without any water problems. I never even noticed them being wet. I guess the seals do a good job as a squeegee. The slide toppers dump any excess water as the slides come in. We have never had a problem with water dripping or running inside. Of course, we haven't had that much water on the toppers either. We moved today and when we started to put the slides in we had some frozen water on the top that fell off and sounded like glass breaking. Scared me to death, LOL but it fell and that was it. If we park under a tree or something that might drop leaves etc. on the toppers Mike goes on the roof and sweeps it off before we bring in the slides. This keeps that junk from rolling up in the toppers.

We've had to move a number of times in the rain and I can't say that water getting inside has ever been a problem. The rubber moldings do a good job of squeegeeing the top and sides I guess. The best solution though, is not to move in the rain if you can avoid it. It ruins the day!

We have a squeegee on a telescoping handle that we run over the sides of the slides before pulling them in, just in case.