Using Sony R1 with a car window mount (question)

[inframan]

I currently use a Sony f828 on a Manfrotto window mount (mini-ball head) in my Toyota truck & am very happy with it. I'm about 5'10" & like to frame using the LCD. The swivelling back makes this very convenient. I'm wondering how the the R1, a taller camera with an LCD that sits in vertical position atop the camera, would compare, height-wise. Seems like I might need a couple of NYC phone books to sit on. Or maybe not. Anyone have any experience with this?

TIA
JP