Carrying people in a towed bus or trolleybus and in the body of a towed truck is prohibited, so it is allowed in a truck's cabin and in a passenger car.
When towing a motor vehicle on a flexible or rigid hitch, it is strictly prohibited to carry people in a towed bus, trolleybus or truck body (clause 139). Therefore, passengers may be carried in a towed passenger car and in the cabin of a truck.
Option 1. Carrying people in a towed bus or trolleybus is strictly prohibited.
Option 2. It is not limited to passenger cars: people may also be carried in the cabin of a towed truck.
Option 3. Carrying passengers in the body of a towed truck is prohibited.
Option 5. It is not completely prohibited: passengers may be in a towed passenger car or in the cabin of a truck.