Thanks Zbanorak!
Below is some more on the steery spreadies here. Hans Witte, a Dutch ex-driver, transport historian, master modeller, transport artist and a valuable contributor to my forthcoming ERF book has just contacted me with some insights into these trailers.
With regard to the two pictures below, he says:
Two examples of steered tandems, behind the Fiat is a Hulo spoorloper, the FTF pulls a Floor brick trailer which has a cable steered rearmost axle.
The Floor trailer pivoted around the first tandem axle, you can imagine how sharp it would manoever it tight spots.
More to come… Robert