google "calculating load centers powered industrial trucks" and u will find many pdfs on how to calculate this along with all other stability questions
basically if you have a 5000lb machine (us) u multiply 5000 by 24 (inch load ctr)
that equals 120000 inch lbs
then if you have a load with say a 36 inch load center
you would divide 120000 (inchlbs) by 36
that would give you a reduced capacity of 3333 lbs
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