Design changes and when they happened?

[Meteor]

Hi all,

New to the forum, considering a TM and full of questions.

I've done a little reading here before registering, so I have read that the design of the TM has changed over the years. For example, I've read that 2619 and/or 2720 (the models I'm looking at) went from a 14" tire to a 15", with a lift kit, as a standard in 2006. When did the walls go from having wood in them to not having wood, and what replaced the wood?

Thanks for all the info, and I look forward to learning more!

Meteor