In theory, good idea. The lines from the rcvr to the driver board are signal, not drive level. So, using one driver board for the front and one for the rear, both driven by signals from thew one rcvr board should be no big deal. But, as Lead pointed out, the actual loads on the individual motors will be slightly differend and result in speed/torque mismatch. Shouldn't cause much problem, other than tendency to pull to one side without the ability to trim out the diff. Should work without burning the driver board's outpu transistors. Might want to put extra effort into venting the driver boards, just to be cautious.

Keep us posted on results.

and, BTW, good to have ya back.

Splat