JosipBrozTito antenn Probably this is the trailer's plate, and the Dutch plate on it was the duplicate of the car's Mmhh.. But why putting it on the side of the trailer where you can't read it in trafic... That's what makes me doubt
Kinda non-sense, but in Italy was actually legal to put the plate on the sides of trailers and caravans. Now old registered can still keep it here, but new ones have to put it on the rear