This first one shows pictures at the bottom of what all this RV can be used for. No, the back porch does not stay down when going down the road. It is only used when parked. These RVs are toy haulers and the "porch" is the ramp used for loading and then it is cranked up to cover the back opening.
Wouldn't that back porch make a great place for my pups to play? They then could be either under roof or out under the sky above.They come in all sizes and as class-A, class-C motorhomes or as a fifth wheel, or a bumper pull trailer. I guess that they try to make one to suit every body's needs.
You may think that this is a new idea in design and layout of modern RVs, but that would not be the case. I am sure that Keith of http://theflyingtortoise.blogspot.com/ blog could tell you a lot about house busses that have rear porches. Maybe something like this one:
Some are converted busses like the one above but many have been made from scratch by from an old truck chassis. The one below would be an good example of what I am talking about:
Back porches are nice to have when you are out camping, although most modern RVs do not have one. No matter if you have a back porch or not, get outside and enjoy what Mother Nature has dished out for you today, but no matter what it is, have a great day, you hear?