I can only tell you how our yard works.
when I see a vehicle pull onto the scale I write their heavy weight down. then I ask them what they have after they pull off. Most times you can tell a truck is full of steel.
If they have steel i direct them to the steel pile. If they have AL siding I tell them to put it in a hopper, same with large amounts of AL extrusion, AL cans, rotors, etc. Then they pull back on the scale and I get their empty weight.
The scale is used for one type of metal at a time. I don't know how other yards work if no worker comes out to eyeball the scrap. some yards might require all steel outside and everything else inside but I dont know how they wold handle 1000 lbs of siding.
OP, if a truck has 2 types of metal, the first two numbers are for their first weighed item like steel and then the third weight is for the second item. So, three trips across the scale: weigh in, unload steel, weigh in for empty weight of first item. Unload second item and go back across the scale for the empty weight from second item. the second number is the empty weight of first item and beginning of heavy weight for second item.
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