Hi Bob, sorry for the delayed reply, been laid low. My trailer is below and is not the blue one.
My trailer is made using the stub axles from the landrover welded to a tube which acts as the axle thus achieving desired width. It was a tight thing fitting the width of the carrier between the trailer wheels and come within the legal road width for a trailer over here. So much so that when I drive the carrier onto the ramps Lining up has to be within 2" either side of track for it to fit!
If I was to build another one which I would, it would be a flat wooden deck.
Here is a view of my trailer as I was having a slight unloading mishap after retruning from a show!!!
Nigel