Dual Wheel Trailer Stop

This is a wheel stop I designed for our horse trailer. It will work on any dual-wheeled trailer that you need to prevent from rolling. Using a 1/2" threaded rod, some washers and nuts, pressure-treated wood squeezes the top and bottom of the tires preventing them from rolling.
To make it easier to turn the nuts I designed oversized balls which are easy to grip and fit over the nuts making installation and removal quick and easy.