Reading related threads from HMVF:
https://hmvf.co.uk/topic/32404-wampp...-trailer-wwii/
https://hmvf.co.uk/topic/43131-trailer-12-ton-jointers/
https://hmvf.co.uk/topic/30439-taske...-trailer-free/
I think it is clear the 1/2-ton Jointers trailer is a post-war manufactured trailer, using (parts of) the wartime 10-cwt trailer design, possibly even using some leftover wartime parts.
