Bluff® Edge Of Dock Leveler - 20,000lb. CapacityBluff Edge Of Dock Leveler 20,000lb. Capacity Edge of dock levelers are the perfect choice when the original building did not include pit mounted levelers for fork truck traffic that is from 5" below dock level to 5" above dock level. The Bluff product includes molded bumpers and a mechanical spring operation that takes the heavy work out of the lifting. The patented design assures that the leveler is positioned exactly for correct use every time.