Sorry to hear of the trouble.
The best way to tow is with a trailer with brakes. I don't know what went wrong here but the benz is still sitting on the dolly right side up so apparently it was not lashed down wrongly.
Glad you didn't scratch those new hubcaps I sold you!
Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.

[SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.