Trailer laws in Oz are "interesting" to say the least.
* Once the total weight exceeds 2000kg, then override hydraulic brakes are unacceptable and have to be replaced with electric or similar.
* Maximum trailer width is 2.5 metres (8ft). Wider than this and you need a permit to tow it. Wider than 3 metres and you need an escort vehicle.
Three ways around this -
* the boat dealer turns a 'blind eye' to the problem and registers the trailer as it comes from FW (some do!)
* they 'kludge' the trailer as yours has been done
* you buy a boat that just fits within the regulations like my H190... A method in my madness - weighs in at 1995kg and 2.45m wide.
I've got to admit Clarko the rework of the coupling is a bit agricultural and certainly not how I would have done it, but then again you have to do what you need to do to get it registered in each state... obviously that is what needs to be done where you are in Queensland.
Seems like you need to change your Hayman Reece coupling to one that gives an additional 4" of lift by the looks of it. Lots of different types available - go to the Hayman Reece website
http://www.haymanreese.com.au and have a look at their weight distrubtion hitches under 'Products'. I have used these for years towing racecars around the country with no problems whatsoever. They work great.