I designed this solar house on wheels to be built on a tandem axle 8×20 trailer. Approximate trailer and material costs for an insulated shell would be well under $20,000 depending on materials used and a good scrounger could do it for much less.
I entered this design in the Jack Daniels Instructable contest with a first prize of $25,000 and if I win I will construct the solar house on wheels and do a step-by-step video, ebook and printed book with the plans.
Even if I don’t win I will release the plans as an ebook and the sketchup files which are completely modifiable so anyone with basic carpentry skills could build one.
The video should give you some ideas for how to build one and feel free to offer suggestions for improvement.
The youtube video: https://www.youtube.com/watch?v=sZKtGRGW1-U
Instructable: https://www.instructables.com/id/Build-A-Solar-House-On-Wheels/
LaMar