Seat belts need to be solidly attached to the frame- in the event of an accident your body weight will double of triple and the ply wood, you think will hold, will pull out, and as I stated before, the angle of pull is critical also. My only intention here is for individuals considering adding seat belts to their cart to make sure they are properly installed, as you would hate to find out that they were not, when you need them to work most.
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