I made the door between our home kitchen and the laundry room into a dutch door, so we could have the Dobermans inside but not underfoot in the kitchen or roaming the house. I'm sure they could clear the lower section if they really tried, but they stayed behind it and it worked well. A couple of dogs that we had later liked to rest their head on the door top (I made it a shelf, about 15 cm or 6" wide), which was disconcerting for some visitors.
I wouldn't depend on this arrangement for an exterior door to keep a dog inside a house or RV, and this one is way to low for any dog we would have, but it's interesting to see creative ideas such as the dutch door and drawer-format refrigerator in RVs. There are probably others in European caravans like this that are worth considering.
That's probably the greatest value of the Nest to RV enthusiasts: Robert has been willing to try some unusual features, and if buyers of US$40,000 small trailers are willing to try them out, some of those features might find wider adoption. The frameless (or monocoque) structural design is the most expensive, and likely to prove to be of no benefit... but hey, I applaud the effort to try it.