I am not sure about your "on the hoses" commend is talking about.
Many devices have a regulator built into them to fine tune the
propane to what they need. But I would in no way depend on them.
The unit in your picture is a very old single stage unit. So forget about finding a name plate. It has not been made for along time now and if it were it is not what you would want. For one thing it actually like draws about equally from either tank so they will run out about the same time :-( More important that is a single stage unit and that has safety issues.
I had to replace mine. And found some of this out ;-) You can get a replacement which will draw from one tank and then only when it is empty draw from the other so you can count on not running out. Most of them also have an indicator to tell you when the one tank is empty and you are drawing from the other one.
Also modern units are two stage. Now your propane is a liquid. And the last thing you want is the liquid coming out of say your stove as a liquid. This would turn your stove burner into like a flame thrower. You don't want a flame thrower going off inside your camper ;-) Now the old style units were a single stage and were designed to, hopefully, fail when they failed to not pass anything but it was possible for them to fail so that they would actually just open up and pass gas directly into the devices.
Yes this is a low chance failure, but it did happen. So they designed the two stage system. The first stage drops the liquid pressure to a gas, but still a bit too high. Now if what comes out of that stage will still be noticeable, but not a flame thrower. Then the second stage will drop it to the right level. The second stage can take liquid and make it right, but it will do so in an manner you are supposed to notice or it is supposed to shut down and not pass anything if the first stage fails. No "flame thrower" like hitting the ceiling of the camper.
So you want a modern unit. Something like this
https://www.amazon.com/JKLESA-Automa...zcF9hdGY&psc=1