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There is no DOT requirement that jack stands be used under the front of a trailer that is unhooked during loading and unloading. OSHA has a requirement in their material handling regulation that addresses using jack stands on unhooked trailers (specifically, 1910.178(k)(3) states, “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”). The company needs to evaluate the risk and decide if upending is a hazard, and if it is, then require the use of jack stands. Typically, what will cause the trailer to become prone to upending is: