A new potential buyer, looking for insight.

Well the green machine the OP speaks about aren't out there because the RV industry is in the business to make money. They build what sells. So if that means fat leather chairs, solid wood cabinets and tile floors, well that is what their customers want. Many many class A RV'ers do adapt solar panels to their rigs to dry camp, especially those through out the south west, but to mass produce, that would be to expensive for a limited market. If the OP wants a rig that will last I fail to see where "green" construction and materials is going to help him. Perhaps he can dump his tanks into a larger tank and use the waste material to make fertilizer in his spare time.