Our 2006 Sunseeker lacked an entryway light. You know the situation, you come back to the camper at night and its full dark outside and inside. Unfortunately the nearest light switch is back by the dining table. Huh, that don't work too well. I don't like to leave a 12v light on while we are out, don't want to melt a cover and such. So, after I thought about this for a while I decided to add a light over the door so we could see to get back to the other switch.
The light fixture came from Camping World, the switch and wire came from Walmart. The electrical connectors came from Harbor Freight. I decided to locate the switch next to the "porch" light switch since it was right by the door and I could pick up pos 12v and ground off of its wires. I drilled a hole in the bottom of the cabinet and routed the wires under the plastic trim that goes around my door. Here are some photos.