Construction on the TM

I have been reading a lot on wood rot on the older TM models. I have a 2006, 2720 SL and wondering if things have been changed thru the years. I don’t even know if I have any wood in the construction of the trailer like the other people post. Is their anyway to fine out what is inside? I am still learning things. I am sure many changes have been made since 1983. Thanks if you respond.

Dave