Jim Clark drove a Lotus Ford Cortina at Sebring one year, every time he ran the Esses he put two wheels up at each transition peak. Esses were different then than today's version, exit was just before the old MG bridge. What he did seemed routine for him. My dad pointed it out to me, you had to be in just the right place to watch both sides, front higher than rear, not a lot of air, but seemingly exactly the same every lap. Plenty of drivers raised one front each way, but he is the only one I recall raised both.