To be clear my Carson trailer is the drop deck and not the Goldie... I bought Carson trailer a couple of years before that was released.
As to what I have purchased, it is from a guy in Germany, called Ivans Model workshop(
http://www.ivans-modellbauwerkstatt.de/), not cheap.
Unlike the Carson, it does require a lot of finishing work.
Anyways onto some photos:
Axles with springs -

Gooseneck - partly assembled

Rear Frame - suspension mount
Cheers,
AP