Be interesting to find their history, and how they ended up being used on a farm trailer of all things
Here in Oz post war farmers bought up aircraft being disposed of as a source of nuts, bolts, tubing, wheels for making carts, even just to get the petrol out of the tanks as rationing was still in place. Uncle, a motor mechanic, had a couple of metal fuel tanks from an unknown aircraft in his shed. Farmers were adept at fashioning what they wanted/needed out of what was to hand, an aircraft was a veritable aladdins cave of useful bits.