The trailer shown is the Taskers folding trailer, an earlier thread shows an un-restored one somewhere.
Taskers do not seem to have any details, I contacted them and got nothing.
The trailer behind the AEC is the Cranes 5 ton, which I would like to get more details. I have this one photo that was supplied by Les Freathy (thanks), but would love to get some idea of dimensions and tyre sizes.
George.