They are probably just a bad combination. What with a limited consumer market, road safety regulations, boat safety regs (no doubt), emissions standards. I assu

They are probably just a bad combination. What with a limited consumer market, road safety regulations, boat safety regs (no doubt), emissions standards. I assume that in addition there are many engineering problems which makes mass producing an amphibious car impractical. And they would probably have horrible, disastrous road manners, not to mention limited boating pleasure. Just buy a trailer.