Somebody posted some information about that on the forum about a year ago. I'm not 100% sure, but I think it might have been Freonjoe.
Isn't he the one who has posted photos of cranes dropping the big commercial rooftop units right onto his trailers?
I seem to remember that he had a rule of thumb that said to expect "so much recovery of ?(maybe copper) per "Ton" of air conditioning capacity.
A PM might be in order here.
Another route would be to talk to your buyer and see if he can give you a feel of how to relate the rating of the equipment to how much weight to expect.
Jon.
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