@menotu: you can switch the incandescent bulbs in the existing tail lights with LED - no problem. I did replace the bulbs with LEDs over a year ago.
Match whatever you order with the numbers on the metal of the incandescent bulbs.
The LEDs will generate less heat than incandescent. I almost lost a tail light because the incendescent bulb melted a reflector.
I used these two (from the big online store):
- WHITE
4.6 out of 5 stars 1,144Reviews
GIVEDOUA 1156 LED RV Bulb , 1003 BA15S 1141 7506 LED Replacement Light Bulbs for 12V RV Car Camper Trailer Interior Indoor Lights Backup light etc, Super Bright 5050 18-SMD 6000K White,
- RED
4.5 out of 5 stars 8,077 Reviews
iBrightstar Newest 9-30V Super Bright Low Power 1157 2357 2057 7528 BAY15D LED Bulbs with Projector Replacement for Stop Tail Brake Lights, Brilliant Red
Match the color LED with the color of the lens. White-white, red-red, amber-amber.
- For reverse, use the white LED.
- For tail, blinkers and brakes use the red LED. The red LED will make your tails, blinkers and brakes very, very bright. I tried both white and red. Red LED won.
(Some forward planning: when you install blinkers and have LED bulbs, you will need an LED relay).
Hope this helps.