Hi tomflowmax: Here is the plumbing schematic for my 66 Trade Wind. Nope, it ain't a 62, but it might give you some perspective on what goes where. I've replumbed the 66 Trade Wind and the 86 Limited and some of the 69 Globetrotter.
Actually, the plumbing schematic for most trailers is rather the same. You've got two pressure sources: city water and 12v
pump water. You got a "main" line that pressurizes cold side of faucets, the toilet, and fills the water heater. And you have the hot line out of the water that also goes to the faucets also. I used 1/2 PEX on the main lines, and 3/8 PEX on short runs to faucets and the like. I used PEX fittings with cinch clamps. You also have a check valve that prevents 12v
pump water from running out the city water inlet.
I also included the diagram of the drains and vents just in case you get overly ambitious.
Good luck with your project. I started by getting on my hands and knees and labeling the lines and components. It helped me understand what goes where and why.