I went through the middle of road train territory early last year but my camera was in the trunk, saw a few parked that would have been great pics too, remembered to keep the camera in the car on the way back but alas not a trailer to be seen. The most common transport here now is a Bdouble, two trailers but not on a dolly set up, the front trailer has an extension and the second attaches to that, I will try and get a photo so you can see, they look amazing and are a lot easier to drive than you think
I did check the site and some amazing loads for sure, my humble layout wouldn't do them justice and the club is usually just big through trains, there is the occasional working day but it is usually on a public holiday and I am too far away for a one day run.
One of the members bought one of those huge brass heavy haulage flat car set ups, it looks great but nearly $1,000 for an N scale car is out of my pocket range.
]:)