I posted a picture here several months ago and was told that these are Huck brakes. One of the people said I would find I needed 2 wheel cylinders for each of the rear hubs. Officially, Huck brakes ended witht the 1950 model, butI found out that due to extra parts being available, some 2 ton models had Huck brakes as late as 1953, though very few. I never looked at the rear wheels until now and there is only 1 brake line going in to each of the rear wheels. I haven't opened them yet, but I assume that means only one wheel cylinder.
Thanks to everyone for their input.
