Wish I could help...

However, I have seen a LM American towing a Countach on an open bed trailer. I have the picture at home somewhere. I will try to find it. I do not know how far the combo was towed, but you can use that as a weight estimate.

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Sold #FLA12191 in 2002
Currently
Jalpa #FLA12242 is in CA being reverse engineered to help supply parts for future rebuilds,

Jalpa #JLA12411 Possibly The farthest North Lamborghini in the World (having made it to the Arctic Circle in 2006!)

I won it, bought it, now own it. Jalpa #JLA12382 Being restored in NH.