Please if your going to put lights in your truck, MAKE DAMN SURE you can't see the lights if your sitting in the truck from and seat, there's nothing like seeing where the lights are coming from, and from personal experience it looks alot better when the lights just stay on without pulsating.
My ex-girlfriend asked me to setup her car (2003 Toyota Corrola Type S- Black) with red ones, and I took an entire day to take the interior apart, hide all the wires, attach the bulbs, and make sure you couldn't see them from any angle, results, really neat looking effect.
just take the time to do it right, cause if you don't it's gonna come out so tacky!