$3 stick steer lock.

[JoshKeller]

Made this up with a pretty heavy hinge. Motor does not move at all while trailering. Just a simple heavy duty lasp hinge.

 

[overboard]

Simple and effective; that's a good idea! =D>

 

[RiverBottomOutdoors]

Genius.

 

[Jim]

Awesome! :beer:

 

[KMixson]

As long as it doesn't flip into place as you trying to steer the boat it should work fine.