[Sohcahtoa82]

> A car designed by insects would have six wheels, but then people would reject the model as ugly.

I doubt this. There are physics issues involved with 6 wheels.

First off, where are those extra wheels going? Dually pickup trucks exist, but that's just so they can carry heavy loads.

If you put them anywhere other than close to the existing tires, unless you attach some sort of steering mechanism, or perhaps use casters, turning becomes a huge problem as those tires would have to skid.

No, we use 4 tires because it's the most stable and efficient number of tires to use unless you need to carry a ton of extra weight.