I've seen some euro designs online I really like. Love the look of the german made ones that have a garage under the rear master bed large enough for one of these little spec cars like a SMART. Seems like such a great idea, but based on the photos it looks like it might be a compromise with other areas of the interior not being to my sense of taste or liking.
Still, I wonder if any US citizen has ever bought a euro model and shipped it over.
Re the slide, I agree with you about a full wall slide, but I don't agree for smaller partial length slides. I may sing a different tune if mine ever gets stuck or causes a problem, but they seem like a decent trade off to me.