Over the years I've accumulated like less than 10 used tires; hauling more would have same impact (or higher) as using local rocks, clay, even wood from thinning.

Eco building is no one-size-fits-all, you've got to use what you have and use your imagination - that's the main lesson earthships teach us. There is absolutely NOTHING special about particulars. Design is cool that's for sure, but then again, not my style.

Myself, I steer more to the school or Mark Oehler and Paul Wheaton, although using their ideas directly is totally infeasible in my place (it's a swamp), the approach is very exploitable.