Wheelez have a European distributor in Spain.
I use a modified garden fence post bracket to secure the front of the trolley to the trailer.
The one I currently use is similar to this but I don’t install the bottom bolt cover so the side plates are longer.
All I do is drill 4 holes for the U bolts which secure the bracket to the trailer.
It occurs to me you could do something similar to attach the trolley to the drawbar of the the hitch either using U bolts or through bolts.
TIP: Cover the securing bolt with a piece of plastic pipe to prevent it chafing on the aluminium trolley
Or get someone to make up a custom bracket with sides set diagonally to match the V angle of the trolley, similar to the images below.
You might find someone to design and create it through the Maker services here
There’s a Helsinki metal workshop which has done projects for trailers here
