Sooo with no idea of your budget or size of crawlspace or ground condition etc
I would hazard a start with a RC flip or stunt car because they rely on skid steer therefore on the spot rotation is available.
Then look at how much camera and lighting you can fix on it.
An example would be a tyco rebound.
Or you could pay someone a few grand for a prebuilt crawlspace robot the size of a dog.