I don't have an originally wired Surf Side, but I did some creative wiring few years back to some 6 volt batteries that included the installation of a converter, 1000W inverter, inline water pump and a few lights
and dc outlets. There is also some basic AC wiring for an air conditioner that I installed (when I moved here from Canada ... desparately needed) and an AC light
when we use a serviced site. I have the schematic and I can describe where I put everthing. If you want to see it, let me know.