So when i bought my truck i couldn't get the cargo lights tho work even swapped over to led bulbs in it and only the brake light works the cargo lights wouldn't, So i bought a new entire unit and its built with pre-installed leds and still only the brake lights work not the white cargo lights any idea what's up?

 

if its not the bulb its somewhere in the wiring, fuses, relays, or switches. Chasing electrical issues is sometimes like chasing a ghost.

 

Like Andrew mentioned. Try replacing any bad Relays, Fuses, or Wiring, related to the Cargo Lights Circuit.