If you do some googling, you'll find some making these. You can buy complete towable quaint tiny homes on a trailer from a few sources. I recall reading a mag. article about one builder who I think, was in Oregon but can't find a link. You'd sure get noticed in a CG with one of them. There's even some sources for buying a trailer/chassis specifically for building your own tiny house on. If you built your own, I wonder if there is an inspection required or special insurance?
Here's some examples.
Tiny house talkTiny homes