Yeah, I can't seem to find any of that style with couplers attached. I would install body-mounted coupler pockets but i'm not sure if the passenger coaches would make the corner on my planned layout.
The trucks on cars on the first picture are different than any models posted. Notice they have a unique equalizer. Also as a general rule the older steel coaches for local and commuter service had specific type trucks even on different railroads. The newer streamlined coaches; smooth side and corrugated, had especially designed trucks for higher speeds. These are different in look and suspension is different. The last picture posted by
@Smudge617 shows the truck especially designed for streamlined high speed coaches; you can tell by the length of the truck frame and by what looks like a torque shaft. Torque shaft was there probably to prevent oscillations from side to side, but I am not an expert. You didn't post pictures of your passenger coaches. So if you are modeling the older commuter coaches or local stock, the newer high speed trucks shouldn't be there, they would look out of place. Here are a few examples of pre-streamline era coaches from early XX century into late 1920s:
That truck above belongs to a Pennsylvania Railroad commuter coach from very early time in XX century.
Next is a steel baggage from pre-streamline era:
Next a Delaware, Lackawanna and Western commuter coach with open vestibule:
You can see the similarities between the baggage above and that coach. Last from the end of the so called "Heavy weight" era is a Reading Company commuter coach probably from late 1920s:
These three have a combination of leaf spring and coil spring suspension.
This next car is an anomaly, and that's because it has been heavily rebuilt and is used on one of the main Class 1 railroads:
You can easily see that it is straight from "Heavy weight" era by the roof, but it rides on newer design streamlined trucks. This is obviously not in revenue service, but in some kind of test service.
Now we come to "Streamlined era" which started in 1930s. Your typical coach (actually a Pullman) from that time is a Chesapeake and Ohio with the never trucks:
You can also see how far the truck is from the end of the car, and on sharp curves of a layout truck mounted coupler would probably be better. A few more from the "Streamlined era" on BNSF:
Secondary suspension with the torque shaft easily visible above. Next one was part of that test train with rebuilt heavy weight car, but this one is clearly from "Streamlined era":
Last one is a high level "El Capitan" coach from 1950s:
And same thing, secondary suspension with a torque shaft easily visible.
I completely forgot! Probably important to do that.