Possible Clues:

• Certain park visitor
• Excerpt from film 'Travelling Home'
• One who complains, getting stuck at back of slowest truck
• It can be towed or be seen in a cinema
• It follows a car but may be seen in the cinema
• Short film advertising programme
• Rear section of articulated lorry
• Camper
• Extract for advance publicity
• Better half's about to complain in caravan