Curbside slideout... design trend?

Curb side slides are the result of adding more slides period. Curbside slides have come the norm because the street side already had slides but consumers still desired more interior space. putting slides on the curb side was a simple solution. Those two opposing slide create a lot of interior room.
The effect on the exterior is minimal. You still have the entire outdoors to work with! If the slide ruins the exterior or takes up too much patio space
you are choosing sites way too small..;)