So you would like to build your own rover? The Waveshare Wave Rover Robot Chassis is worth a look. It has a full metal body. It can support Raspberry Pi 4B, Jetson Orin Nano, and Pi Zero and other computers, which can communicate with the built-in ESP32 computer through a serial port. This chassis also has 4 x N20 geared motors.
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You can attach a LiDAR, camera, and other smart modules to build an advanced robot. It has flexible rubber tires for navigating rough terrains.