Box to frame U Bolts

[Grant Bowker]

For those who may not know, I have Alex Blair's manual collection and the only reference to body construction is 1941 version reference in the post Hanno links to above.
I don't have material on the Lindsay construction for the house bodies or the for the later steel cargo bodies (and the machinery bodies made from them).
Also not known are the construction details for trailer bodies (except that some of them are very similar to the later steel bodies - may use some identical parts or sub-assemblies like tailgates).
I would be happy to hear from anyone with details mentioned.