I did this mod a couple of years back and I love that the LED light is under the steps, lights them up perfectly without direct light pollution in the eyes, even when seated around a campfire.
I added a rv style switch on the inside of the door near the porch light switch. I tapped off a 12v live line, porch light, and then snaked the wiring down through the wall, into the floor, out under the trailer where it connects to the LEDs under the steps. Whole thing looks professional and works great.
I rarely ever use the porch light now...step light provides enough light without being annoying.