Traveling with a tailbone injury

My late husband had a tail-bone problem and I found a slanted cushion with the cut out in back. It relieved the pressure on the tailbone and he did fine for at least 50 miles at a time. I seem to remember Walgreen's. It was not the round type donut.

I fell in TN years back, actually broke that bone and just sat on a pillow all the way back to FL.