Basically have 2-seat vehicles where like, someone operates the throttle and brake, while the other person steers.
You could also have a vehicle where the seats are back-to-back, one person faces forward, the other one faces backwards. The person facing forwards controls the steering in the front axle (as well as throttle and brake control), while the person in the back controls the steering in the rear axle (and shoots some dudes in like a death race or whatever).
In a death race it'd basically be about teamwork. For the first vehicle, the person controlling the steering would basically have the job of being as stable as possible so the throttleman could aim and shoot people effectively. For the second vehicle, when both axle's wheels are turned in the same direction, you could thus turn more sharply, giving you an advantage in tight turns granted you use your teamwork properly.
