You sure your warranty was through fleetwood/coleman? A Keystone has a 1-year warranty with 10-12 (I forget) on the roof, but if you look at the details, that roof warranty only covers the membrane and is provided by the membrane manufacturer, not Keystone.. Membrane is produced by Alpha Systems, owned by Dicor.
My point is:
What the sales guy sold you may be very different than what was in writing. I don't think the Alpha membranes fail very much... or at all - most common cause of failure is not maintaining the roof by owners who think that their roof is warrantied for a long period...