Make sure whatever you do is legal.
Have your licenses with you.
Have a copy of the FCA with you.
I read somewhere (could be GunSite) that there was a directive around this from Metro - if so, maybe find and carry a copy of that.
Have a good lawyer who understands the FCA on speed dial.
Have a dash cam.
When you are in a roadblock or get asked about carrying, comply with any legal instructions, and always handle firearms safely if need be.
Be courteous and do not lose your cool.
Make sure whatever you do is legal.
Still will not stop some thirsty or hungry Metro cop to try extort KFC from you, but it can only help.