I've been devouring as much HPV stuff as I can Google. I've read the pros and cons re: Delta vs Tadpole but besides the Pedal Car racing fraternity in England quadcycles are just about ignored. I have seen some recreational (Rhoades Car) multi-passenger four wheel designs but the only high performance quadcycles are built one off for racing. Do quadcyles effectively end the Delta vs Tadpole argument and if so why are they not more used? I would think with modern materials one more wheel (than three) should not make such a critical difference in weight and/or rolling resistance? Pedalcoupe.com has an interesting vehicle for sale. What say youse guys? TIA.