From my understanding the "flash" has something to do with the trailer lights, transmission shifting, vsc, etc. It will actually, help keep the trailer from swaying.
If you end up towing quite a bit, I think they do fit Jeeps with the trailer package with a mechanical clutch fan in addition to the electric one, and heavier duty transmission and power steering cooler. It something we discussed in one of the posts. Personally, my boss has an 08' Lib with the trailer package and been wanting to take look at it everything to be certain.
When you get knee-deep in a situation, floor it.