The one thing about glass mounts you have to be concerned with is factory tinted windows, usually they do not mix to well.
Are you using the glass mount for scanning only or you looking at transmitting also? If transmitting, I would stay away from them and go with a cowl mount or if you can go with a two-axis lip mount for your back hatch if its possible.
Joe "Izzy" Navin
Rigs: BCD396T, BCD996T x 2, BC780XLT x 2, PRO 2006, PRO 2046, BC560XLT, BC350A, Yaesu FT-7800R & VX-6R, TRS-452 & TRS-453.