Extremely good quality waterproof wiring
Yep , i'm routing my cord the same place your talking about but from my bumper to that hole inThe Ford Transit has plastic hole covers on the driver and passenger sides located just forward of the rear bumper under the van. I and several others on the forum have used this location for installing an exterior power inlet. In my installation, I replaced the larger plastic cover with an aluminum plate for mounting a 30amp Smart Plug marine/RV power connector.
Marine grade wire has each strand plated to resist corrosion in a wet or salt/fog environment. For most wiring inside a van, less expensive stranded copper wire should suffice.
His was a dual 12v/propane, which I'm actually seriously considering because they're dead silent. But they can be really sensitive to being unlevel. I hate the whirring buzzing sounds of a compressor, so a totally silent fridge is a big plus in my book. When temps are right and the a/c is off, inverter can be powered down, and I end up with zero fans zero compressor noises. I read and write a lot, so that kind of silence is worth a premium. Every hotel I've ever visited (I travelled for a living for 2 decades), the first thing I did was to turn the mini fridge all the way to low. If it still came on, I unplugged it. I haven't done more than cursory shop for my build fridge though. Smeta 3 was a glanced at item, but some reviewers said more than 2 degrees off axis and it stops cooling, so that's a no go. Some of the 12v coolers people say are near silent, so I may look into them. If anyone has a great silent 12v mini fridge they found, please share.Van Gogh
"Blew out everything but the old propane fridge"
The old propane fridge is probably the only thing anybody would want to blow out , would be
a good excuse to get a nice modern 12v fridge