For those that do have these GPS screen head units, what extent of off-roading do you do? I looked into the GPS units and was worried about holding up under 4x4 conditions on a long term basis. I would worry about the hard drive or the screen itself, in them going bad after a lot of off-road usage. I am hoping if they do hold up, to do a single din install GPS screen install and a CB either above or below the GPS head unit.