The newer vinyl flooring offerings are a great product. I've seen them going into some very high end houses and they look great. They are glued down as opposed to floating so there are no soft or loose spots underfoot.
For an RV I can't see a negative. Ceramic tiles are used in higher end coaches and hold up, so a flexible vinyl tile should be fine. Like anything, the result will largely be a function of the prep work and installation. I work with houses and all the "latest and greatest" products daily and am planning for vinyl planks when redoing my kitchen. I'd put them in my RV in a heartbeat.