Do not store it in the trailer - it isn't about the temperature being 100, it is that it is meant to be stored at a steady, moderate temperature. Storing it outside, in the trailer, etc exposes it to temperature fluctuations.
Oh no, I wasn't aware of the instability with temperature extremes. My bottle is stored in my trailer so it will have to be replaced. The problem is that when I need it will be inconvenient to have do go home from the barn to get it.