Is the "truss" made of wood or are you seeing the "air conditioning framing" that's made of wood?
Typically, the roof trusses span the trailer from sidewall to sidewall and are made of the "advertised material" and after they are installed, additional framing is added for roof vents, air conditioner installations, TV antenna mounts etc.
You might want to take a look "beyond the immediate framing area" to see what's installed in other locations.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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