Does anyone have any experience sizing motors to drive these wheels? I am looking to move about 300lbs on a set.
Hello @Mosfco and welcome to the RobotShop forum,
I suggest using this tool:
With it you can estimate how much power, torque and speed the motors will need, and with these values, you can select the most suitable motors for your robot.
You can then check the Brushed DC Motors section of the store or the comparison list
Although to move 300lbs you will probably need geared motors, you can find them in the Gear Motors or the Servo Motor Power Gear Box sections.
Let us know if you need further asistance!