A-double is any heavy vehicle combination featuring a prime mover towing two semi-trailers that are connected to each other by a converter dolly. As it is classify as a “road-train” combination, the length can go up to 36.5m allowing for extra load making this combination very efficient. With slightly reduced length and PBS approval, this combination is becoming very popular even in some metropolitan areas. Being a longer combination you may need to consider a self-steer axle for better maneuverability.
You can find out here how to equip you’re A-Double combination in a most efficient way.