There is a few threads on here about Johnno's Trailers.
I think the consensus is that they are a solid platform to build on. They have a very easy tent to setup and good quality canvas.
There has been some people report different problems with finishing and this comes down to the the place of manufacture and the individual that built the trailer.
However it has been well reported that Cub is now making the trailers in SYD.
my build thread
HereMalcolm's build thread
Here Do a search for some more
Cheers