I have. I have always preferred to load coil shotgun. The last time I loaded suicide, that is what I did to secure it. When I had a Reitenour, or however you spell it, it was a lot easier because there were 2 tracks each side, not just 1 at the rail.
First off there's a big difference between the forces involved in a head on collision and a hard brake situation. Second there is a big difference between securing coils properly and securing them to meet the minimum legal status standards. Legal minimums are wholly inadequate at times.
And i can't see even a coil being secured beyond the standards being kept on the deck if a driver slams on the brakes. Not all those chains are pulling the coil rearward. At most less than half of the aggregate will beholding it back.
I run a connie and ALWAYS load suicide unless customer requirements differ. I use JHooks and a minimum of six 3/8s chains through the eye and a strap or two over the top. BUT I also "drive my freight". Meaning I remain aware of just how much weight I have behind me waiting to turn my precious, unique butt into a bloody smear. Between my securement ans my driving, I've never had a coil move or "telescope". There's a reason why fulltime steelhaulers are a special breed amongst even the elite flatbedders.
Or even when traffic slows, you start slowing, and a dozen cars decide they need to be between you and the brake lights ahead....