Where is the wood?

I am under the impression from the videos on the Trailmanor site that the Trailmanor does not have any wood. However, after reading Mr Geek's reply in the General discussion about the Hold-Down latch pulling out it looks like wood is still being used.
I also read in one of the forums that starting on a certain model year, that wood was replaced with aluminum.

Does anyone know for sure if wood still being used and the locations that it is used at?
If it was discontinued starting with a certain model year, does anyone know what year?

Oh.... and thanks to everyone for your replies about hot/cold beds.