After taking the trimmer apart, I observed the circuit to come up with a way to control it via the Arduino and the 6 channel RF Receiver. Here is the PCB inside the trimmer.

I only need to get another 5v relay module to replace the trigger switch of the trimmer and program the Arduino to detect the signal to Channel 3 of the Remote control and activate the relay that will turn on the trimmer motor. The other switch on the bottom left of the picture is for adjusting the motor speed between slow or fast. Which the default is fast so I will leave it as is. Next I'll add the Arduino code changes and mount the trimmer motor attachment to the RC SnowByte.