I've got the older version of the Tab Tite for an 8" Tab 3 and it works fine for that smaller tablet but the Ram arm mount bounces some when off-road. Their ball mounts are great in applications without a lot of jarring movement such as on-road and even on boats, but the more parts you add or the longer it gets the more movement you'll get. The X-Grip series works OK for something small like a phone on a road bike or car but I wouldn't trust it in a high vibration use or with a larger device.
We used the pedestal mounts in our ambulances and they work OK, but you need to have a support up as close to the device as possible or you get movement; that was with a Toughbook on them though. I tried one in my Tacoma for a netbook and again, OK on road, worthless even on Forestry Service roads.
I'd look for something like the bar mount setup used in Jeeps and FJ Cruiser, they seem to be more secure.