It depends on what type of LED you have, some just have an LED placed in the incandescent socket. So just remove the LED lamp and insert and old style lamp. But if these are installed by the manufacturer then you'll have to swap out the fixtures. Search Amazon for "RV Ceiling Lights" or go by your local RV dealer's parts center they always have lots of light fixtures. I'd say minimum of $20-25 per fixture, you install. Lots more to get them installed.
LEDs do put out a fair amount of heat, just not as much as the old style lamps.