Possible Clues:

• Where one shifts stuff from the estate?
• Outdoor market
• Vending from back of private vehicles
• Cheap market failed in October, alas
• Event involving trade conducted from the back of one's vehicle
• Where you'll see many a bumper trade event
• Market where visiting American may make a trunk call?
• Close to a bar being redeveloped? Some bargains here
• Where bumper bargains may be had?
• Vehicle-based flea market