In Ernest Cline's novel Ready Player One, the main character lives in the "stacks" - a dystopian vision of what a trailer park may look like in the future. The "stacks" are primarily composed of trailerhouses stacked
... at least fifteen mobile homes high (with the occasional RV, shipping container, Airstream trailer, or VW microbus mixed in for variety). In recent years, many of the stacks had grown to a height of twenty units or more.
The trailers on the bottom level rested on the ground, or on their original concrete foundations, but the units stacked above them were suspended on a reinforced modular scaffold, a haphazard metal latticework that had been constructed piecemeal over the years.
There's also a great picture from the cover which helps visualize:
I'm curious how feasible this actually is. Can a typical mobile home support that much weight? Can standard steel scaffolding provide enough support? Can the ground support that much weight without a better foundation than typical for a motor home?