Useful video:

Dual output container and cigarette/usb sockets I’m using this for a temporary housing unit. You can buy similar from Amazon.

Blade Fuse box kit from Simplysplitcharge.co.uk was an easy way to make sure I had all the right fuses and wires that I needed.

I swapped to a Durite non-lit usb socket

Again, to make things super simple I got a 12 volt usb wire connector kit from 12voltplanet.co.uk Spec as follows:

• Voltage rating: 12V DC & 24V DC
• Fuse holder current rating: 10A max.
• Cable spec: 1.5mm² / 16AWG (21A), UL rated
• Battery connection: 6mm dia. brass, non-insulated ring terminals

And finally an interesting blog post around wiring in campervans.