These bulbs are Edison screw base bulbs for replacing standard household bulbs and wouldn't work for the marker lights on an RV, although they are very compelling for their intended use, I hadn't seen them before, but I digress. Most marker lights are a 194 style wedge base bulb, LEDs for those are readily available.
Try this page at Superbright LEDs
to find what you are looking for.
For porch lights Starlight Inc. has some new LED bulbs. Go to thier site here
and scroll half way down the page to see them.