When you do rock crawling you want to use a locker front and rear, which locks both wheels together so they spin at the same time with the same torque. This is necessary when crawling over rocks! With diff, the wheels won’t spin when encountering big rocks.
Another thing – high torque requires high power. Using 3S or more can give you the horse power necessary to climb through obstacles. Ideally you should be able to keep a 3S inside the compartment.
If not, some wiring will be necessary to house it externally.
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