Mark, First off you need to let us know a little bit about your trailer, how long, how many outlets and fixtures, are you adding a weathertite outlet box with a GFCI outlet. What about the fridge? Propane or 120 vac. You mentioned 12 vdc/120 vac fixtures, those are okay but a photo would show if they need rewiring. How many outlets and intended use. You've got the walls open, installing a few extra outlets won't hurt. I'd also look at RV wall switches for the light fixtures, beats the built in switches.
Is there a junction or service box with fuses in the trailer?
Here is a
linkto a catalog where you can look up what is available. I think that assuming you'll have batteries and a 120 vac line you can find a nice little distribution panel. Are you going to want a converter/charger or just a charger. Converter/charger will provide 120 volts and 12 volts to charge the batts and light the fixtures.
12 vdc wiring can be stranded and for the most part #14 or #16 for light fixtures. The wires for the window AC will most likely be okay with #12 romex.
All in all it would be an easy job even for a novice.
If you want you can PM me and then we can post what we talk about later so all the guys are included.
