In order to build your own robot tank, you are going to need a decent chassis. The Hiwonder Tank Robot Chassis comes ready for Arduino, Raspberry Pi and Jetson Nano. It has 2WD motors. It supports 6-12v power supply.
This kit has an aluminum ally construction. It ships with 2 tracks, 2 metal driving wheels, 10 plastic bearing wheels, and a base panel. You can find out more about it here.