As Bruce Brown pointed out, it could be how they were set up. I've had a 2003 Itasca Suncruiser (2 slides) and a 2006 Monaco Diplomat (4 slides). Neither of them ever had a leak and if we weren't out in them they were setup at home so we were with them all the time. We bought a Carriage 5th wheel (3 slides) just before moving over here and went through the winter (Oct - Feb) with rain and snow, no problems. Don't give up on a rig with slides just because sales folks don't set them up properly, but at the same time, I wouldn't buy one that you have already seen leaking. Even if it doesn't when set up properly, the water has already started doing it's deed. Good luck on your hunting. I'm looking again too, and I have to deal with the snow, not just rain. :R