Ancliff Tankers Manchester

Bit off topic but here’s one for the anoraks. What is the difference between a Scammell Crusader and a Scammel Amazon? To my naive mind, I always thought the Amazon had a pair of rear axles where the Crusader had a single rear axle. Recently I have seen a couple of twin rear axles Scammells badged up as Crusaders. Let the fun begin.