Looking at a friend's new 2720 yesterday, I noticed that the stirrups on the support bars (that you put your foot in to lock down the torsion bar support) are larger than mine - maybe by 3/4 to an inch deeper. Don't know if that was a 2007 or 2008 change, but it was pretty recent, since another friend's 2006 has the same size stirrup as mine.
I think the most "major" changes happened around 2003. If I were looking for a used TM, I'd opt for a post-2003 model, since those changes were significant improvements. And '03 models can vary as I think some changes were made during the year. My 2003 has a standard A/C and square bumper. A friend's 2003 3023 has the low profile A/C and the new "sleek" bumper (with access to the shore power plug when closed).
good luck!
Alan
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