Bed lighting wiring

I know this has probably been covered somewhere at some point but I just bought some bed lights to install. Will have an on/off switch in the bed, so what wire under the bed (assuming trailer wire) could I use for an all the time power source?

 

You can do a really simple basic search using keywords like “bed lights” and it will net you a plethora of threads and posts on the subject.

https://www.tundras.com/threads/bed-lights.58104/

You can also do some research here by checking the wiring diagrams https://www.tundras.com/threads/ultimate-tundra-wiring-diagrams-collection.81448/