My 1938 ford reference book says to keep tires inflated to 30psi. 1932-1948 Ford maintenance manual has spread sheet for specific psi for specific tire size. Hopefully the pics are clear enough to read.
Not Sure if I'd run 32psi as that is max rating. Personally I run 30 psi all around. Although the maintenance manual specifies 28 psi for my tire size 6.50-16-4. The amount of ply's play a part as well as size.