The usual "de-rating" formula is; A truck with a 4000lb capacity @24" load centre is lifting a load with a 30" load centre -
Multiply 4000x24 (our capacity x load centre) =9600. Divide 9600 by new load centre (30) = 3200lbs our new capacity
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.