tensegrity

Wait, what's wasteful?

I'd be EXTREMELY wary of the type of roof rack that will be used. The older vehicles like those pictured with rain gutter mounts will be best. They are super strong. But with newer aerodynamic vehicles where the rack has feet that rest on the edge of the car's roof--the roof may not be strong enough to support people. OEM racks (like the ones with bars that slide back and forth) are very unlikely to be strong enough. Source: I was a design engineer for a roofrack company.