Introducing the Self-adjusting Superchock for Single wheel trailers.

Use the Superchock on boat trailers.

Superchock is self-adjusting.
Use the Superchock for Single Wheel trailers to stop that boat from taking a trip without you.  The Superchock is the world's only Self-adjusting wheel chock. 
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Remember to un-chock your wheels when you use this Superchock's Hang-Tag.

Use the Superchock on small trailers.

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The Superchock for Single Wheel trailers will keep that little trailer from moving while you use it at your campsite.  For extra stability you can use a Superchock on both wheels.