Good job n great write up
Could u not have just slightly lifted the trim with a trim removal kit and slid the wires underneath the mouldings - would have saved some pain and dissaproving looks from the neighbours when they hear your vocab !!??
Anyways, cracking job
For me, I think when I need to consider power in the back I'm going to get a power station that charges via solar ... To run from the car battery or similar wouldn't be too suitable unless I'm doing say 200km a day for charging .... Maybe I just don't understand electrical systems (self confessed) but a power station type set up would be very mobile for me from vehicle to vehicle and vehicle to camp site
Running a solar power cable or charging at home sufficient for a day / weekend getaway or charge once at site if your camping for longer and the car is stationary
I'm thinking like an ecoflow or a bluetti or something along those lines
I also want my camper to double as a coffee bsns during the working week so my considerations and power needs are very different
But I do like your thoughts, systems n process
