[CurtEgerer]

I'm surprised your homeowner's insurance won't cover this? My experience here in Michigan is it would be covered and then your insurance company subrogates against the contractor/supplier insurance companies to recoup their money.

I'd ask the contractor if he would consider parking a truck up on the peak of your roof without consulting a structural engineer first. Because that's about the same amount of weight. Of course, if one disassembled the truck into small pieces and spread those over the entire surface of the roof, there would be no problem.