Originally Posted by
serfty
The OP's bags should be through checked (as per QF's oneworld policy) in wich case there's no need to lug bags between terminals.
I've never yet had bags checked through entering the US regardless of single or multiple tickets. It's always been the case I've had to, err, pick up my cases, clear US Customs and then re-check them. I've always just assumed it was part of the US security theatre routine.