I have my C& E class licence which means i can drive articulated lorries, I drove arctics all over France delivering racing pigeons , so trailers are not a problems for me although the smaller trailer the faster it turns..... so a 50ft trailer will go off course quite slowly, but a little thing will crease up within 15ft of Reversing.
Still looking for a box trailer although I found a really nice 2 tonne twin axle plant trailer which I bought myself just for the heck of it, good for taking garden rubbish to the tip.
I thought you can't go onto the tip in a commercial vehicle without a permit from the council but they do allow you to go on to tip green waste, I used to pay £55 a load to a guy to get rid of my tree cuttings & garden waste, but now I can take my own