I'm attempting to build a radio controlled robot/car that has only two wheels, and I need help with the wiring. I was wondering if it is possible to have two servos that are each controlled separately using each of the two joysticks on a transmitter. For example, if you move the right joystick up on the transmitter, the right wheel on the car moves forward. When both joysticks on the transmitter are pushed up, both wheels go forward. Or when the left joystick on the transmitter is moved down, the left wheel on the car goes backwards. If this is possible, please respond telling exactly how to wire it. I know that servos plug into the receiver, which plugs into the battery, but I need to know more. Thanks!

This system is actually one that will do a good job for you, since both left and right sticks will spring center in all directions.

http://www.futaba-rc.com/systems/futj45.html

Other than that, you can either use electronic speed controls for the motor controls or servos that operate switches. Of course, it's all in how you plan and design the power system for your robot/car.