The original wires that run from the switch to the motor are 12 gauge. I used 12 gauge wires for my load wires the trigger wires are 16 gauge.
In order to mount the relays at the load (in the back near the motor) I would have had to run a 12v battery wire from the battery to behind the rear seat. Also the two trigger wires would have had to run from the switch to the back near the relays.
I figured it was six of one half dozen of the other whether or not to mount the relays up front or near the motor.
It works well the way I configured it.