I've worked on a couple projects creating electrical schematics for campervans. Using AutoCAD Electrical I created professional-grade schematics detailing the installation (done by yours truly) and protection schemes of the system.
Here are parts of various AutoCAD Electrical diagrams I created as part of these projects.
See https://van.maroukis.net/06-electrical-systems for system diagrams, also included here
Example 12V Distribution: https://van.maroukis.net/img/screen-12v.png
Example Main Battery Compartment: https://van.maroukis.net/img/screen-main-bat.png
Example AC system: https://van.maroukis.net/img/screen-ac.png
Example Battery Display and Protective Relay Wiring: https://van.maroukis.net/img/screen-bmv.png