Sun is what kills the decals. Consistent, and frequent use of 303, or something like it, is about all you can do. The dark (red or black) are the most vulnerable. I have wide deep maroon decals on the side of my Freelander - a 2010 I bought two months ago. On one side they are badly cracked; obviously the one parked toward the sun. My IR thermometer measures those decals 20-30 degrees warmer than the white fiberglass!
And don't feel bad about not having full body paint. At the Brooksville, FL FMCA rally a few years ago I encountered a company whose primary business was replacing fiberglass sidewalls cooked by the Florida sun. Those dark brown, or red, or black shiny sidewalls on the big Class A's can reach 140 degrees (why they need 3 A/C's) and are often (burned) toast in as few as 5 years.
Plain white is a great color. Alpha was on to something; just didn't execute.