Can you send it ahead to your destination? (ground only, I guess).

It is often a good idea to have a preadressed stamped container in which you can mail something that TSA objects to. That might mess up your schedule, though.

If all else fails, do the trip without the PLB, which is just what you would expect to hear from someone most of whose experience was gained before the PLB (or TSA, for that matter) era.

Please let us know how it goes. I have not heard of any problems with PLBs and TSA.