Gald to hear the driver was OK. That is one sick image.
I would have thaought that towing with a Dually would be a safe bet, however if the only contact point on that long trailer was a 2 5/16 ball that tapers down to 1 inch at the shaft then that was not enough.
There are better hitch solutions out there. This is what I use:
Hensley Arrow
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1971 W30 convert, triple green,second owner.
1971 W30 Convert, special order Rally red, completed
68 Camaro Z28,Corvette Bronze,Houndstooth
2016 Porsche Carerra Cab and 2021 C63S AMG ,modern fun.
www.vancouverclassiccars.com