All these posts about big outdoor GPS robots has me thinking about various chassis designs. I'll bet many of the "kids" here (born 1970 or later) have never seen the 6x6 amphibious Amphicat (circa 1972), let alone an AmphiCar!
Amphicar: The front wheels act as rudders!
"When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."