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Safety First
Placing these under the front of trailers when no tractor is attached will keep the trailer from shifting or upending during loading operations. These can also be used to level a trailer parked on an uneven surface or for a few more inches of lift to reach a dock. Our trailer jacks have a wide stable base to help prevent them from sinking into soft ground.
"Fixed jacks may be necessary to support a semi trailer and prevent upending during the loading or unloading when the trailer is not coupled to a tractor." OSHA Regulation 1910.178 (k)(3)