There is a line of various trucks with advertising on the side parked by the side of the road, with the 'Grilled Cheese Truck 'and the 'Calbi' truck in focus.
there are many trucks
A line of various trucks indicates many trucks.
In order to form a line of trucks, there must be multiple trucks present. If it is a long line, there must be many trucks.
Many trucks are the same as various trucks.