I heard from a friend of a friend of his, he was put in a 55 gallon drum, sealed in concrete and sunk in the Bahamas Trench........................
:^) The body had to be disposed of, and there's no way it was moved that far. Likewise for out-of-state sites in general, such as the NJ landfill, various stadiums on the eastern seaboard, etc.
Car switch, driven in the second car to his secluded "meeting with Tony Pro", Tony Pro was not in the third car, or in fact anywhere near Michigan at the time.
Hoffa was capped in the back seat of the second car, the body was covered with a blanket or something, then both cars left for the lakeshore.
The death car was driven onto a barge. It was late in the day, no one was around, the barge was chugged out some miles, the murder weapon and probably the killers' clothing was ditched into the car, brick on the gas pedal with the windows rolled down just a little, splash.
They return to the shore, having dressed in fresh clothing, they get in the third car, and all four return to somewhere east and a little south.