I'm on my second Keystone Raptor. My first was a 2006 3612DS. We purchased that new. Spent 2 years in Vegas and the remaining years in Montana. We sold it to some neighbors so we get to see it regularly. Its never been stored inside and never had a cover of any sorts on it. The decals still look good and from what I can tell show no signs of fading or cracking.
Fast forward to my current Raptor, 2009 380LEV, and it too sits outside. The right side gets the least amount of sun and the decals are cracking and starting to fade. The left side gets the most amount of sun and the decals have almost all peeled off.
It drives me crazy everytime I see my decals. There are 2 must have's on my next toyhauler. auto leveling jacks and a full paint. If I can't get full paint then I'm building a shop to store it in.