There is a lot of trash in city busses compared to school buses. but I find it hard to believe that theres 30% weight thats non metal. Maybe try a smaller shredder yard. the big guys usually just read off a paper and can't differ from that with out getting the boss involved. somewhat smaller shredder guys can actually negotiate. Plus the big guys generally only want to deal with you if you got a semi or two coming in daily.
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