I know this doesn't help too much, but I remember a while back, maybe a few years ago I saw a 92-96 SC400 parked at a local Bass Pro parking lot that had floor support bars running along the sides of the vehicle. Placed along the rocker panels where the jacking points are the full length of the wheel base of the vehicle.
It was very surprising when I saw it because it looked like an otherwise stock vehicle. I remember wondering what those were and why he had them installed, etc.
Is this what you're referring to? What's the point of them? I know Supras have chassis twist issues on the Targa models but why would an SC need these?