I am in the process of getting ready for the trip west and assessing adapting things like the Recom weather radio and Nancy's tablet, the lap top and the refrigerator in different locations. The commonality for both the Recom and the tablets is that they use wall warts taking AC and converting it to DC of a couple of differing voltages. We will for the most part not be on shore power so relying on solar much of the time. Compass Rose had three power points/cigaret lighter sockets, I don't like them not reliable and I just don't like them, so I have been switching them over to Anderson PowerPoles.
The Recom will take the 12V (I found it's wall wart puts out 18V) so a wire with the proper plug will be wired direct. The tablet wants 9V and I do not want to try it with more so I bought a buck converter that is regulated from China and have wired it with a power pole plug and the correct plug for the tablet. What to do with the Waeco refrigerator when we are out and about and don't really want it to leg off. It will now go inside Compass Rose plugged into a PP outlet.
I did not anticipate all of the things that would be plugged. We tented and roughed it for 35 years, now we get to take it all with us, its a lot more comfortable.
The moral of this story is when you plan your trailer leave the wiring open to expansion and adaptation and...