Question When parked on a flat surface, you should: Answers Use wheel chocks to prevent your vehicle from moving. Not use wheel chocks. Use wheel chocks, but only if you have applied the parking brake. Explanation When parking on a level surface, you should use wheel chocks. If the vehicle is not equipped with spring brakes, this is essential to prevent the trailer from moving. Take a FREE Practice Test Now This questions appears in the following tests: Florida Knowledge Test Class A , Hawaii Knowledge Test Class A , Connecticut Air Brakes , Idaho Air Brakes , Iowa Air Brakes , Michigan Air Brakes , Nevada Air Brakes , New Mexico Air Brakes , Washington Air Brakes ,