FA & Occupancy Type for a Trailer Near Building?

We have a project where there is one large building that has many different activities throughout. There is also a trailer that is not connected to the building by walkway or anything except some plumbing for what I believe is a restroom.

This trailer is maybe 2-4 feet away from the larger main building, and the activity being done in the area closest to this trailer is woodworking/carpentry.

I am trying to determine how the trailer should be classified to determine the requirements for a fire alarm system. I have gone back and forth between NFPA 101 and the IBC, but I am either overthinking or underthinking the scenario.

I would just like to ensure I understand the criteria correctly because these two buildings do not share exit access or an exit, but may share an exit discharge.

Would it be correct to classify the trailer as an existing business occupancy and look at Chapter 39 of NFPA 101?

If I arrive there and look at Section 39.3.4.1, it appears that the three criteria listed there, which the trailer would not meet, result in a fire alarm system not being required.

This does not sound correct but I could not piece together why. A

ny help would be much appreciated! Thanks!

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