Possible Clues:

• Gross weight deduction
• At this rate it sounds as if one may wait for this
• Rate a vetch
• 'Tis, and 'tis a weighty matter
• Shipping weight allowance
• Tis and tis, perhaps, all a weighty matter
• Perhaps 'tis and 'tis a weighty matter
• Empty container weight
• Weight of an empty moving van
• Vessel's weight