It's an Indespension JS06 'vario', if that helps anyone.
250Kgs Unladen Weight.
Carrying capacity 400Kgs.
Adjustable Length capacity of up to 4m.
Leaf spring suspension with 4.80 x 12 wheels & tyres.
Hot dipped galvanised steel.
Adjustable length drawbar.
Winch post inc snubber.
2 x width and height adjustable carpeted bunks