My computer tells me that if you wanted to go 122 mph in a tractor trailer, you will need in excess of 1,000 hp to do it.
Even if you could get that HP out of an engine, unless your transmission, universals and drive shafts where made out of Titanium, I doubt they would not handle the power.
Now, that being said, I did see the result of 110 mph once.
It was an Aerodynamic Kenworth at the bottom of a 8 mile 8% grade. He topped the hill in 8th, popped it into 8 th over, burned his brakes to the ground, slipped it into Mexican Overdrive to save the engine and then drove past 3 runaway lanes before he could not negotiate a 40 mph corner.
The trailer flipped over the guard rails which flipped the tractor on its side. That is what saved it from going over the same 500 ft cliff that the trailer went over.
After sliding close to 700 ft on its side it came to rest in the middle of the road.
He was from Ohio I think.
He walked away from it, without a scratch.
I don't think he came back.
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