Hello. New here, but I have just done this in my 2002 Winnebago Journey DL. I used 3 rows of 6000k LED self adhesive strips in the Thinlite fixtures. Light output is excellent. I made all my connections with solid core wire from Category 5 Ethernet Cable. I put bullet connectors on to facilitate easier hookup. The thinner wire pulls less on the adhesive tape on the LEDs, making it less likely to cause a failure. I too, removed old circuit boards, connectors and such for a cleaner fixture.
I think I am going to remove the ugly discolored covers and lenses and use translucent plastic sheeting screwed to the ceiling. This will give the appearance of more ceiling height.
I have replaced all the other coach bulbs with LEDs except for the undercabinet counter top lamp. I might put a hockey puck light there. Current draw with all the LED coach lights on is less than what A SINGLE DOUBLE BULB INCADESCENT DREW ceiling light in the bathroom drew.
I had trouble with flickering in the bedroom, but replacing the dimmer with an on-off rocker switch solved that distraction.
I used: 16.4FT/5M LED Light Strip, 12V LED Tape Light, 6000K Daylight White, 300 Units SMD 2835 LEDs, Non-Waterproof LED Ribbon, Under Cabinet Lighting Strips for Home Kitchen Bar Party Xmas from Amazon.
Specifications: ●Color: Daylight White ●Size of LEDs: 2835 LEDs●Length of a tape: 5m/ 16.4ft ●Quantity of LEDs : 300●Working Voltage: 12V DC
I bought two rolls so that I would have spares in case of failure. I hate having different colored or different density, thus differing brightness in similar fixtures.
I hope my experience helps someone.