I drive a ford ranger xlt. I stick my pipe bowl first in between the bucket seats. It holds good. When I have a passenger, I move it to the sun visor, With the sun visor in the up position just slide it stem first into place.
I have had the pipe bounce loose from the sun visor and dump ash into my lap. Oh, and I forgot it was up there when I let my niece drive, she got a lap full of ash too. She wasn't to happy with me.