It all depends on how you're going to use it as Al says. I agree with 34 on the light issues, especially if you plan to work there, but even just for parking. That motor home will darken things even more. I've seen color combos similar to what you're talking about. To my eye I'd do the black on the bottom (hides dirt marks if you lean a tire, or anything else, against it) up to about 42-48", then the red in a band about 7-8", then the yellow same width or an inch less. The rest of the way up, and the ceiling, in bright white. As a variation, you could but a wave pattern at 10' intervals around the walls (avoid a zig-zag as it sends a tension message).