Heavy duty trailer jack wheel for boat yacht dock caster chock1、Durable Material: This rugged trailer wheel dock is made of high impact resistant material, which can effectively prevent breakage and can be used repeatedly. 2、Strong Stability: The trailer tongue jack wheel dock holds trailer jack casters in place for more stable placement on uneven roads and slippery terrain. 3、Prevent Wheel Sinking: The trailer jack wheel dock helps prevent the trailer tongue wheel from sinking into soft foundations such as soil, sand, dirt, gravel, grass, etc. 4、Safe to Use: The trailer tongue jack wheel dock has a bright yellow that can be easily seen to avoid being misplaced and provides caution and accident prevention. 5、Wide Applications: Suitable for RV, caravan, trailer, speedboat, yacht, etc. You can park safely anywhere you want with this wheel stabilizer. Easy to transport and store.