Hello!
Even everything is clear, pretty much, I would like to tell few words, about "visible from road/ highway" term.
So, what is the highway in these days, in 21st century? Those gray or black lines with asphalt over it? No, I do not think so, just my 2cc...
Maybe I am wrong, but I think that highways of our days is INTERNET. Internet is the real highway of our times. So, you should not worry about to be seen from someone's car, but from someone PC/phone.
I am talking those above, because if you made your vehicle stock, like this one, you'll have very very unique space. You may expect to be photographed from the variety of individuals and professionals
and be published all over the social networks, and taged well, ofcourse. That way, your selling would rise.
Furthermore, your building is very eye-catching, and at last but not least the most cheap to build!
I wish all the luck and best with this project, and many good rides with these babies....or horses!
Best R