You give very good advice, and your experience shows. Consider writing a small pamphlet sold through mail. Information is vital, and worth while because honesty is a virtue. I knew a lady that became wealthy by selling information; she was homeless when she started. Her name was Louise Hay. You can give workshops across the country for a small fee, gouging is not necessary. To the point: Yes on the 3/4. A motorcycle mechanic from back in day gave a valuable lesson: Always gain a vehicle in its Power To Weight Ratio. Truckers understand, but newbies contemplating life in a vehicle often do not. Yes on the wind resistance. Yes on overbuild. Cold is a major issue that concerns me as I live in AZ and it gets cold on the desert in wintertime. I find insulation is a factor most often not emphasized in builds, or by manufacturers. I learned a long time ago that the best insulation is thermal mass not a heat source, which should (even for homes) be minimal. With advances in polymer science, dwellers can use it to their advantage if they would insulate both walls, ceiling, floor: metal conducts cold quickly! Take care, again, want to encourage you to teach for a fee. You have more talent than realized.