Here is pics of my led install.
Rear wall. I bundled the wires up top so it clears the battery when installed.
Hard to see but it has a pig tail so I can completely remove it.
eBay bezels for rear wall lights..
Here you can see the cab lights wired and tucked out of sight.i have headlights,marker,and turn signals all wired into one pig tail. I don't feel the need to do anything besides turn them on and off so that's why I did it this way...total cost was about $15 and I had leftover led's to do a 2nd truck...
I use "Y" connectors to plug the cab,rear wal,and trailer pigtail all into one where the wires all ends up plugging into a empty receiver outlet for powering the lights and a pigtail to plug into my trailer.
My pigtail from the tractor to the trailer is a r/c airplane RX charging Outlet installed on the nose of the trailer..This way all my truck and trailers can work the lights with each other.
