Originally Posted by
mrreet2001
I won't need any of that.
You don't need that then your stuck with a 2-3 channel radio with a "y"' harness with a reverser and another servo. WOW! Good for you. The OP wants independent 4ws and you need a 4 channel radio or more + another servo for steering.
I just put independent 4ws on my 2021 Kyosho usa-1 nitro and I had to use Hitec lynx 4s radio. One button and I can turn on/off 4ws.