albion1938:
DEANB:
Another light one 6 ton gross from 1960.Click on page once.
0
That’s not 6 tons gross but 6 ton payload, it’s on 8 stud 20 inch wheels so about 9, 9.5 tons gross, it’s an early TK, 1960. Lorries were sold on their makers recommended payload weight (not that a lot of people took much notice
)until the '68 Transport Act when ministry plating was introduced, when makers started quoting gross weights and the authorities got stricter about enforcement.
Bernard
Which leaves the question what made ‘the authorities’ stop the idea of 6 + ton payloads being put on 3 ton UW trucks.Or was it actually always the quoted gross weight in all cases which ‘some’ erroneously and/or conveniently took to mean payload. 
There’s no way that those braking systems at least were designed for that type of weight.