A sealed container for storing a wheeled vehicle has roller supports for the wheels of the vehicle and drive means, e.g. an electric drive, for at least one of the roller supports, the drive means being controlled from outside the container whereby the supported wheel or wheels of the vehicle may be rotated without unsealing the container and removing the vehicle. If the vehicle is left in gear, the engine and vehicle transmission system, together with all the wheels, can be exercised using only one rotatably driven wheel support. Provision is made also for exercising the vehicle suspension by raising and lowering the wheels.