One other thing that a lot of people don't think about....
It's small, but it adds up. LED's use considerably less power than standard 12V lights. With many class A RV's they have a ton of running lights amongst other lights. It can put a lot less stress on the alternator and/or more charge into your house batteries while driving.
Many of us don't mind the power hogging nature of RV's, but they really are. Any steps that we can do to save power, better MPG's, and be more "green" are good things. LED's are the tip of the iceburg and not much, but it's a tiny step to making things better.