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One thing I have noticed. Most trailers have had the data plates replaced and I think a lot of A2's are really A1's that are rebuilds. Some of the A2 mods do get put into older trailers but I don't think they go as far as changing the whole air brake system. If I remember right, the true A2's...

If you have an airtank open the drain. I think it is the A2s that have the failsafe brakes. It must have air to the emergency line to release the brakes unless the air in the tank is drained. If this is not the case then the shoes are stuck to the drums.