12V lifepo4 battery with small solar panel for keep it all topped up..12V to 3.3/5V step down to power the esp32 on the trailer.(maybe a switch to turn it off)3.3v output of the esp32 into another optocoupler to raise the voltages back up to 12V and also make them PWM programmable do some fun things with the brake and turn lights..

Wireless brake lightmotorcycle

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WirelessTrailer lights with Remote

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So I'm going to be making my trailer lights wireless and battery operated with solar charging so I will never have to worry about crappy wiring etc etc all over the trailer and/or a dangling cable out the back.

WirelessMagnetic Tow Lights

i was going to take those and optocoupler them to bring them down to 3.3V and take the running light one and also use it to power the ESP32. So when the car comes on so does the ESP32. The esp32 will be read on the 4 pins to detect when the car wants certain lights to fire..

ESP32 is a series of low cost, low power system on a chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth. The ESP32 series employs either a Tensilica Xtensa LX6, Xtensa LX7 or a RiscV processor, and both dual-core and single-core variations are available. It includes in-built antenna switches, RF balun, power amplifier, low-noise receive amplifier, filters, and power management modules as well.