Weight codes used 1929-1979

1929-1930 - most were simply numeric, however 'A' through 'D' used; exact weights not known; heaviest vehicles received 'A', lightest 'D'; weight code was a suffix (after the numbers)

1931 - 'A', 'B', 'F', 'L' are known as a prefix, but exact classification not known; argument over if it was indeed a weight code; expected to be similar to '29-'30.

1932-1935 - 'A' through 'E' are know as suffix, but exact classification not known; expected to be similar to '29-'30.

1936-1937 - exact weight codes not known

Weight	1938-1939	1940-1955
<2,500 lbs	A, X?	A, B
2,501-3,000	B, V	C, D, X
3,001-3,500	C	E, E/X, E/S**, K, L, S
3,501-4,000	D	D
4,001-4,500	E	E
4,501-5,000	F	F
5,001-5,500	P	P
5,501-6,000	R	R
6,001-6,500	T	T
6,501-7,000	Y	Y

Weight	1956	1957-1970
1-3,000	E (model years before 1955) D (model years 1955 and newer	E (model years before 1955) D (model years 1955 and newer)
3,001-3,500	unknown	none, numeric only
3,501-4,000	J, K?	J
4,001-6,000	A	A

The 1971-base (and later years) received validation stickers. The weight class code was the first letter of the serial number of the plate from 1971-1979. The validation sticker also had the weight class letter. Weight classes were discontinued in 1979. Unknown if 1980-1982 original issues continued the plate-number weight class.

Weight	1971-1975	1976-1979; 82?	Stickers 1972-1979
1-3,000	A (model years before 1955) B, C, F (model years 1955+)	A (model years before 1955) B, C, D, E (model years 1955+)	A (model years before 1955) B (model years 1955+)
3,001-3,500	E, G	G, H	C
3,501-4,000	L, M, P	L, M, N	D
4,001-6,000	R, W	R, S	E