The best rest I've ever found for a vehicle: One of those neoprene jacket-cushion things for a beer can, cut off a bit past halfway down, and a deep-ish notch put in the edge to hold the shank/stem.
I drive a diesel F-250 with a stiff suspension and manual transmission, and haven't had a pipe jump onto the floor yet.
I drive a diesel F-250 with a stiff suspension and manual transmission, and haven't had a pipe jump onto the floor yet.