has anyone had luck finding LED replacement bulbs for tail, dome, or marker lights? I have tried a few and can't seem to find any that are bright enough.

Thnaks...

I dont think there's any nice LED brake lights available for the GX, but you may certainly change the dome, door, and plate lights to LED...

Check with Sylvania's website for the different bulb sizes if you decide to try out some LED bulbs out there