If the stock tilt lock isn't broken, the motor is supported properly while trailering long distances which will protect the tilting hydraulics. If the steering hydraulics are in good shape (greased, good oil and cylinder seals, etc.) and the motor easily rotates while trailering, you could simply lock the steering wheel (bungee cord, rope, etc.) first if you would like to avoid installing a transom saver. I haven't found the need to install one myself, even on my old outboards that rotated while Locked in the tilted trailer position. (Just my experience).
