Thanks for that – Yes, now I have looked more closely at the photo, I think you are right the size 10.00 x 11.5 – afraid I just cut and pasted from the owners email.

I have not seen the trailer lately – its probably stuck out in one of the fields with its collapsed tyre!

When I looked more closely at it a couple of years ago, I could not find any cast or or stamped numbers, probably due to the layers of paint and mud! But will try to look again.