A $200 towing bill does not automatically mean another $20 should leave your wallet. Tipping a tow truck driver depends on the service, the circumstances, and what that hefty bill already covers.
Unlike restaurant service, towing rarely comes with a simple social rule. The driver may have spent 20 minutes hooking up a car, or they may have spent an hour in freezing weather wrestling with a vehicle stuck in a ditch. Those situations feel very different.