I rotate my big-screen to point out the back window of my TT when towing and normally route the signal from a front-facing camera to it to create a "cloaking device" that allows those behind me to see what's going on ahead of me, especially when they want to pass.
If someone insists on tailgating me, flashing their lights, sounding their horn, etc., I have some pre-typed messages on a computer that cycle, and I can switch in that video to the big-screen. The messages include, "I May Be Slow, But I'm Ahead Of YOU!", "Please Just Get It Over With And Pass Me ... While That 18-Wheeler Is Coming The Other Way!", "Please Pass ... Blind Driver In This Vehicle!", "Don't Follow Me ... I'm Behind a Highway Patrol Vehicle!", "If You Feel Like You're Going Slow ... See Einstein's Theory Of Relativity ... The Planet Is Just Rotating Faster In The Other Direction Under You!", "My Cell Phone Number Is XXX-XXX-XXXX ... Please Call For Customer Service!" (which is actually the non-toll-free number for the Highway Patrol), "Why Did The Chicken Cross The Road? To Keep Us Going This Slow!", "Distance Remaining To [destination ahead] XXX Miles ... YYY Miles [a much larger number than XXX] Counting The Potholes!", "Rear-View Camera Live Streaming Directly To The Highway Patrol.", "Huh ... The Speed Limit Is The Same As Your IQ!", "Don't Blame Me ... Blame The A$$HOLE Behind Me!", "Passenger ... Please Tell Your Driver To Pull His Cranium Out Of His Rectum ... Then Explain What A Cranium And A Rectum Are To Them.", "If You Can Read This ... Then I've Mistaken What Non-human Great Ape Species You Are.", and so forth.
Reactions as people pass me range from thumbs-ups from those with a sense of humor, to non-index-finger "salutes" ...