FlyBye wrote:My concern was how or with what do I connect the brass stub with when it enters the trailer, regardless of being horizontal through the wall or vertical through the floor. I didn't know if there was a preferred way. I will not have a fill tank to hold water inside the trailer, just water on demand when hooked up with a hose when offered at a camp site. (brass fitting, pex, flexible hose...)
I connected Pex directly to my fitting that came through the wall. I am no plumber, so I do not know if that is a "no no", but it seems to work well. I figure if you are coming in brass, you have to connect the Pex at some point and it seemed to me to be the easiest place. The only thing I'd do after that if you are running directly off campground hookup pressure is 1) Make sure to have a pressure regulator inline with your hookup hose at the connection point to the campground hookup. That will protect your hose (ask me how I learned that) and trailer. 2) put a shutoff valve in the main line coming in just in case you spring a leak inside. You can quickly shut it down without having to run out of the CTC unless of course the leak is between the inlet and the shutoff valve.
See pic below. Up on the top left, you can see where my water is coming in. The small connection on left is the "City Water" hookup like you are talking about, and the other larger blue hose is the gravity feed for my water tanks.
The check valve is built into the fixture I used. Not sure what the fitting looks like on your connection , but if it is not directly Pex crimp compatible, you will need a transition piece of some sort. You should be able to take the inlet you have to the hardware store and match up a fitting to convert. The inlet I used was directly compatible and appears to have been designed for the Pex to crimp directly on. I am sure it was luck on my part, as I don't remember shopping for it with that in mind.