Hope it all works out for you. When we bought ours we had a weigh bridge certificate for just the trailer without the canvas, kitchen, etc and two receipts, one for the trailer, one for the rest. We paid stamp duty and rego on the trailer price and weight. That was RTA Albury and maybe we shouldn't have been paying that either but at least the cost was based on the trailer only.
Dave
Nick from Mountain Trail campers had arranged for me to get my CT registred in Albury to. I got it weighed at Albury recyclers which cost $22. I was meant to get a blue slip done in Albury but I was running out of time before I had to get to work so I came straight back to Barooga. When I did get my blue slip done they told me that I didnt even have to get it weighed at the weigh bridge as the TARE weight was already on the ID plate next to the VIN number.