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			I'd be afraid of overloading 1 scale as you set it down.  Don't know what they are rated to. I would assume they are in Dave's garage, but don't know for sure.
 Weigh a truck, put the item in the truck, weigh the truck, subtract.
 
 Some cranes/hoists and maybe fork lifts have a "scale" built into the lifting system. Lift each end and each side and do the math.
 
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