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.
Mike G.
Liberty is meaningless where the right to utter one's thoughts and opinions has ceased to exist. That, of all rights, is the dread of tyrants. --Frederick Douglass
photo: Yosemite Valley view from Taft Point