Which one of the following covers a trucker while pulling an empty trailer or operating the tractor with no trailer?

The Business Auto coverage form primarily offers coverage for vehicles used for business purposes. However, it does not specifically address the unique needs of trucking operations or the scenarios of pulling an empty trailer or operating without a trailer, making it less suitable for truckers.

The Motor Truck Cargo policy provides coverage for the cargo being transported by a truck and is applicable only when the truck is carrying goods. This policy does not cover the trucker when pulling an empty trailer or operating the tractor without a trailer, as it is focused on protecting the cargo rather than the truck itself.

The Trip Transit policy is designed for short-term coverage of cargo during transportation. While it offers protection during transit, it does not extend to cover liability for the trucker when the vehicle is empty or when the tractor is operated without a trailer. Thus, it fails to meet the needs specified in the question.