Hi Guy's
The top photo shows a Diamond T 969A 4 ton wrecker on the left, and a Diamond T 980 with Rodgers 40 ton trailer.
The next two photo's are both Federal 604's.
We have two 604's in our collection, one is driveable but has been repowered with a slightly later model cummins (bought it that way).
If you use the search engine on this sight under the heading federal you should see a older thread with lots of pictures etc.
I have both manuals on truck and trailer (not for sale) but can help with any information needed on these free of charge
Here is the trailer, a Trailmobile 22 1/2 ton 4 wheel 4DT (single row of 8)
Made by the Trailer Company of America in Cincinnati Ohio.