Mark, move the RX as far away from the motor wires as possible. based on the lay out of your truck I would put it at the rear if you have long enough leads on the steering servo and esc.

With all the cash you have dumped into that I am surprised to not see a 2.4 ghz radio system. Am radio and high powered BL. When I made the jump from FM to my dx3r I was blown away at the linear throttle control and increase in range. I can go play next to a power substation and lose visual on the truck before I lose range now.