The responsibility is on the seller to have this test done, so if you are purchasing an RV be sure to see the paperwork. This regulation is in place to protect people from any unprofessional work that may have been done to the system. Many people feel that their pet will require tranquilization for the trip. If this is really needed, it might be best to have an alternative plan such as a Pet Sitter or use a good Boarding Kennel. Tranquilizers should not be used unless approved by your Veterinarian as they will affect each animal differently.
Cats especially react differently to tranquilization.
Be considerate of your pet and be sure that your pet will be comfortable and happy when traveling.