Travel Trailers with a rear bed slide... Leaks? Issues?

If I remember correctly a member had a KZ with a rear slide that he had to rebuild the back of the trailer due to a water leak. The other issue I've heard of is the slides can be hot or cold because of lack of insulation in slide. I would goggle water leak rear slide for whatever make and model your looking at. Don't have any personal experience with them. Maybe some owners will chime in with more information.