The weight pushing down in the center would likely be fairly even in pressing down, but would it also be top heavy? I don't understand the physics involved but I assumed trailers connected low for a reason, and that weight distributing trailers which do some of the same job to equalize the tire pressure per wheel would hopefully be comparable.
If not I think the design should be implemented for heavier vehicles.
I've seen the vid before. Would think mileage would not be too great aerodynamically either as is or in potential vs aeromodded trailers. It's more for convenience.