You are holding a driving permit class C. Your truck has the following specifications: - empty mass 9000 kg - permissible total mass 18000 kg - permissible towed load 22000 kg Which trailer are you allowed to tow?

In this scenario, you are allowed to tow a trailer as long as it adheres to the limits outlined in your driving permit and the specifications of your vehicle. Since you hold a driving permit class C, you can tow a combination of vehicles under certain weight limits.

The permissible total mass of your truck is 18,000 kg, and you can tow a trailer with a gross mass not exceeding your vehicle's maximum allowed limit. In your case, you can tow a trailer that has a mass of up to 750 kg without requiring additional permits.

The other options, such as trailers with a permissible total mass of 18,000 kg or 22,000 kg, exceed the towing limits for your class C permit. The weight regulations are in place to ensure safety on the roads, preventing excessive strain on the vehicle or issues with handling and braking.