The vehicle I am creating has extra wheels.
Some of the wheels are off the ground by default, but the presence of these wheels seems to quickly deplete the entire vehicle’s power and cause it to stop moving. Similarly, if you drive over an object and your wheels go airborne, you will lose power and can easily get stuck.
I adjusted some parameters that seemed relevant, but it didn’t improve the situation. This is probably a bug, but please let me know if there’s a way to fix it.