Possible Clues:

• Old tiara bought initially off the back of a lorry
• Dog food that's dropped off back of a lorry
• Dog food from the back of a lorry?
• Back of a lorry, where dog and pig died
• Story heard - listener's not interested - back door found!
• To follow directors, one drops behind
• Dog food dropped from the back of a lorry
• Dog-end on table on back of lorry
• Seen on a lorry that's badly lit abroad
• End with the directors on the wagon