There are a lot of boats brought down from Qld by professional transport but not much goes back, about 5yrs ago I backloaded a Tornado to Qld on its trailer, was about $600. Can't remember what the name was but if you call boat retailers up your way they will tell you who they use. The depo they used in SA is on the Port River at a slip next to the Submarine corporation. Your other option is All states removals they do the SA-Qld run and a Mozzy would fit inside their trucks