Sidewall Problems/"Gassing"/Checking of Paint

I spent most of this weekend looking at coaches in the 2003-2007 range, mostly with full paint and dark colors. I didn't see signs of checking on any of the coaches. We looked at a 2007 Holiday Rambler Ambassador, a 2004 Kountry Coach, a 2006 Holiday Rambler Scepter, a 2005 Monaco Diplomat, 2006 Camelot, and 2005 Windsor. Most of these looked like they were at least stored under a roof because there was little paint fading or water marks. I was wondering if maybe the dealers did something to polish the paint and temporarily hide the checking?