I have always had much anxiety over the center bar on my Vario stand. That's what I miss about my old home made wooden stand, wide open in the middle. Bad enough to fall on the smooth ground. Falling on that center bar would be misery multiplied several times. I always have a pad under me, but I don't feel like it is enough, I need a thicker one.
Sorry about your injury, it sounds bad!
I like to hang from trees just big enough to do the job, and as close to the ground as possible.
For I consider that the sufferings of this present time are not worthy to be compared with the glory that is to be revealed to us....that the creation itself also will be set free from its slavery to corruption into the freedom of the glory of the children of God. For we know that the whole creation groans and suffers the pains of childbirth together until now.