Did a little more research on lighting. Super useful resource on how trucks and trailers should be marked with both reflectors and lighting:
https://www.grote.com/fmvss/
Also i realized I was missing reflectors, so I modified my setup a little. I found some tail lights that look kinda like 2017+ tail lights!
Etrailer.com was great to deal with unlike a previous poor experience with southwestwheel.com.
Lighting list:
2x Optronics STL1211RFHPG - combination tail, brake, signal, reverse light
4x Optronics MCL44RB1 - combination red reflector and illuminated marker
2x Optronics MCL44AB - combination amber reflector and illuminated marker
As usually, measures stuff, made a 3D printed adapter, and got the tail lights to fit on the framing.