Google "color temperature", a million color charts; while they may vary a tiny bit, most pretty much agree with each other.
As for what to use in your RV, that's up to you. Many prefer warm, but warm is too yellow/dingy looking for me. I wanted more light when I made the conversion to LEDs. I prefer about 5000K, which is actually the same color as natural noontime daylight; neither blue nor yellow. Once you hit 6000K, it really starts starts to look blue, lower than 4000K looks yellow.
Here's my conversion and pics