On the subject of wood types, I recall seeing a publication on this forum about types of wood. As I understand it, various types of hard and soft wood would be acceptable to the MoD. In other words, the MoD as client would not specify "oak", but "hard wood", so the supplier could use birch, maple, ash, oak, etc., whatever was available and suited the job.
Other than that, IIRC cargo bodies on WW2 trucks and trailers were made of soft wood?
Can ayone elaborate on this?
Regards,
Hanno