Actually, my 28 is titled as a 2003 and has a build date of Jan 2003. There is no 2003 SO choice on the site so I picked the 2004 SO choice. Was 2005 the last year for the 28 before building the longer ones exclusively? I know we aren't many.
My parts list has the shorter stainless rivets listed, 325101, and their location used elsewhere in the skin but not the longer 325121 used around the SO opening.
I have had no structural issues at all except the dreaded corrosion around just a few limited rivets and exterior joints. On the other hand, the tank monitoring system has never worked correctly and is permanently on holiday these days.
Twice a year I spend considerable time servicing, cleaning, and testing every system throughout. Tended, everything but the refrigerator has held up (besides the tank monitoring system). It was a recall unit and had developed a leak.
I have upgraded all the roof openings to the newer design fans with big blades and variable, reversible speeds.
I installed the new Dometic 7 cf refrigerator last year which my wife really appreciates.
Three years ago I switched out all exterior and interior 12v
light bulbs to LEDs and enjoy the extended battery life when boondocking.