[EricH]

Originally Posted by ajd

You could still use rack-and-pinion steering with such a scheme; the input would just be tank drive. You would have to come up with a mechanical way to convert between the two representations, though, unless you consider drive-by-wire solutions.

If it's a RWD, add a motor. If it's 4WD or front-wheel drive, it's a lot harder.

It's simpler if you can just add a second steering wheel near foot level.