51b Trailer with large hubs

[numi]

I am adding a proposal of the new list for 51b Trailer. Please comments.
Antonin

It all depends on whether we chose to regard these as error pieces or as variations that were manufactured deliberately.

I feel that these #51b JD trailers should be given their recognition & identity as true variations cos its proven that more than just a single specimen exists.
numi

[nickjones]

I already have Antonin's update waiting to be added to the site.