Got into this discussion kinda late, but I had the exact same issue a few years ago. Here's the link to my story and the photos of the finished product.
Typing this on my mod today some two years after. There's been no problems at all. The DW doesn't use it much while actually travelling, but with the roll out slides, it's perfect for anyone sitting in the co-pilot seat. There's no braking mechanism in place for the desk. If an emergency were to arise.........a lot of things might rush forward even though we clear almost everything we can think of for travel down the road.