Possible Clues:

• Bullet casing
• Printer ink container
• The vehicle reaches the crest in this case
• Printer insert
• Case to convey before watershed?
• Container wagon to drive across the North of Grampians
• Magazine good for having in journey by wagon
• Sort of paper that holds a lot of ink
• The vehicle may be on the rise or go off
• Casing for charge and bullet