When I converted my twin bed 27' Overlander to a double bed, I wanted an office workspace on the street side. The problem was making a desk that didn't require a chair, but at the same time didn't obstruct the passageway. I finally hit on a simple translating top, using three full-extension drawer slides. It isn't perfectly solid when it's fully out, but it's way good enough to hold a laptop and type on it.
