Thanks Johnny Mac. Yeah I'm going to move onto that License.
I'm pretty sure its the same for you guys but over here we run a 3 stage license system.
First you go for whats known as the "heavy rigid" such as one of these..

Then you move onto one trailer known as the "heavy combination".
For some reason there is a loopwhole where you can skip this stage. Then onto multiple trailers known as "Road trains"
For anyone who's never seen a Road Train its pretty impressive when it passes you.
Its one of these...

I can drive the prime mover at the start of the train but only when no trailers are attached (at present)