Looking for a controller to drive 2 wheelchair motors

I am a high school student in a robotics program at Northern Secondary School in Toronto Canada. We have 2 wheelchair motors and we made a tank design with 4 wheels and a chain drive. Our group is looking for a controller to drive these motors. We have a rc transmitter and receiver and were hoping you have a controller that can drive these two motors off of two rc channels, as in using one joystick to control the robots forward backwards and turning motions from the two channels of the joystick. I looked at the AX3500BP controller but it doesn't say much about the hookup for rc controllers.

The instruction manual of the AX3500 has a section explaining in detail how to hook up a radio receiver to our controller. It is pretty easy. You can download the manual from www.roboteq.com