USB and 12 volt DC
My Jayco was manufactured in 1994. USB wasn't a thing in 1994. I had to add USB jacks and while adding the USB jacks I also added 12VDC jacks.
The first photo is a box I made and installed on both sides of the bed (I left my hand in the photo for a reference for size). This box has "2 USB jacks with a voltmeter in between the USBs", a "cigarette lighter" jack and a "Barrel" 12-volt jack. If memory serves, I ran a 20-amp fused 10-gauge wire to the bedroom from the fuse panel and split to the two boxes (second photo).
I purchased all the components from Amazon. I am unable to access my Amazon account now because it got hacked and I no long have access to my purchase history to include links to any components.
The only thing I don't like about the box, is the USB voltmeter readout is very bright when trying to sleep but has to be on to charge the phone. There is a switch to the right of the right of the meter that turns off the USBs and meter. The simple fix is to take a black washcloth and cover it at night.
I found the CPAP cables on either Amazon or Ebay for the CPAP (RESMED 10) we have, which require 24VDC. I also have 2 machines I leave in the RV that require 12VDC, so we don't have to take the machines from home.