Just wanted to share with everyone my experience with LEDs.
I got my 2011 Rockwood 2604 last month and based on suggestions on this forum I ordered some 36 LED units from this eBay source> SMD 36-LED Warm White Interior Room Dome Door Car Light | eBay
I got them today, which took about 10 days from China, and since I just got back from my second camping trip, I installed the 6 units that I bought.
They came packaged with three adapters. Here is a pic>
also, here is a pic of a fixture where the left bulb is original and the right is the new 36 LED uncovered
here is the same fixture with the covers in place
Sorry these shots are during the day, when I did the work. So far they seem okay, although not quite as bright as the original bulbs and the color is softer