Mike, you've resurrected the Kamp Master! lol
Guys ... I don't want to sound like am armchair snob ... but there are Tiny Houses, and there are RVs. And (as you all know), you don't frame, side, roof, wire, plumb or finish the two the same way. Anybody every try to wire (at all to code) a 2x2 stud frame with a 2-gang GFCI outlet and 3-way switch? Good luck!
Building a lightweight RV is one thing; building a lightweight "house" on a Chinese farm trailer will violate every code in the book!
If you just need to move a Lilliputian Tiny House once or twice in rural country ... why not build it on skids? If you want a mobile residence, lightweight, on wheels, with the bare necessities - well, you've just invented the RV!
Or at least a cargo trailer conversion.