LED light fixtures for the coach exterior have come from The Big Rig Chrome Shop. They were high quality and have had no burnouts in almost five years for my clearance lights. I also got the sealed type so I no longer have to worry about water leaking around the lens and shorting out the bulb or getting inside the coach.
For internal lights I just got 15' rolls of 5050 LED lights and cut them to length for my fluorescent light fixtures. This took a little soldering but I have had zero problems with them almost five years later.