Are you talking about when trailering, or just when storing on the trailer? In the summer months, it is just fine to leave it tilted up on your transom saver. During the winter months, tilt it down. The water passages are designed to drain completely when the motor is tilted down, so in the winter, when it could freeze and bust a water chamber, tilt it down. In the summer, it matters not. I leave mine up, as it would be more effort to tilt it down. If you have power tilt, you may want to tilt it down. I don't know if you would want the load constantly on your tilt cyl, and some seep down after a while. If you are on a transom saver, that is of no worry.