I am a new 2008 3485SA owner and am reviewing just what truck I am going to need. I think I have read every post and this seems to be a popular, if somewhat controversial, topic. In my search for information I hit on this site which at least gave me some insights into how to choose a vehicle and the manufacturer's tow ratings back a number of years.
http://www.trailerlife.com/tech.cfm
To make sense of all the information I am toying with the idea of putting all in a spreadsheet including rear axle weight ratings which I am currently researching. I am only looking at vehicles that have a tow rating of 12,000 lbs or greater, a Gross Combined Weight Rating of at least 20,000 lbs and a rear axle weight rating sufficient to handle a hitch weight of at least 1,700 lbs. I will probably include 2004-2007 trucks. If I get up enough steam to actually complete the spreadsheet I'll share it here.
Great forums and I hope to visit often.