MOT Failure - Opinions Please

Whoever prepped the truck is at fault, they should check the load ratings, it is simple old school stuff.

But and there is always a but, my view is an mot inpsection shoudl take longer than a mpi/inspection etc just so you have the time to check this ■■■■ stuff.
Plus add in the fact the incab plate hasnt shown tyre size or ply ratings for many years now, so if the mech has not got the info to check it against how can he check it?
The plate you have in your vehicle files should show the tyre info.

Against the mech he should have spotted they had different load ratings across the axle and known something was up.