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One thing they did not show is if the semi had traction tires, street tires or chains on the drive tires. All the semi needed was enough pull to move it to where it could get traction to move the truck forward from where it was.
BTW, Mayfair I've seen something close to this being done before so for me being a former OTR driver I can believe the Hemi did help it get moving. Oh and I bet the semi trailer was empty and why it needed help moving forward as the tractor didn't have enough weight on the drive tires to get traction where it was setting. My $0.002