Specifications include, but are not limited to: Replacing a trailer TMA that was destroyed in a crash with the same or equal model TMA. The TMA that was destroyed was an Energy Absorption (SST) Safe Stop trailer unit. The TMA will be pulled behind a single or tandem axle plow truck. The TMA shall safely absorb collision energy when impacted by an oncoming vehicle. The trailer shall be standard production of the latest model with standard accessories and in addition meet the following minimum specifications: 1. Crash Performance a. Must meet at minimum NCHRP 350 test level 3 requirements; including NCHRP 350 Test 3-50, Test 3-51, Test 3-52 and Test 3-53, (no exceptions) 2. Axles a. Axle must meet the required gross vehicle weight rating of the trailer b. Equalizer spring or torsion suspension