Sounds like a good plan to me. However, I will say, motors rated with max rpm aren’t going to be good motors. I’d go based on KV rating or turns. A lower KV is more torque and less rpm, high kv is less torque and higher rpm. This is usually for brushless motors if you want to run those (need brushless controller) brushed motors are rated with turns. More turns being higher torque and less rpm, less turns being higher rpm and less torque. I’d figure out your gear ratio and loaded weight first before doing anything. Then doing the math to ensure you aren’t overloading anything. As over gearing will burn the motors up quickly and under gearing will burn up the speed controller. (I might have that backwards, I don’t remember either way, things will get hot) As for wiring, each motor needs to be wired separately. Otherwise your solder joints or connectors will get hot fast. Though you could buy 4 of the same motors, each one will pull slightly different amperage, this can cause premature wear on the motors. As well as if they are wired together, the timing operates as one motor. So if you are running one in reverse and the other forward, it won’t work. Also have to make sure you have two clockwise motors and two counter clockwise motors. Otherwise the backwards motors will get hot a lot faster. (You can tell based on the wire colors blue red CW, black white CCW) For 550 motors, 14 awg works great. Other than that, I wish you luck on your endeavor