Hard side expandable trailers

TTs with slideouts are very common nowadays, and they seem to work fine 99% of the time. Occasional water leak problems around them, and once in a while someone has a motor go out on the slide (usually there's a hand crank backup, check for this) or some sort of alignment problem. But they are the exception.

I had a slide on a 2005 Rockwood, owned it for 3 years, no problems with the slide.