I have been looking for a car mount for my galaxy tab for a long time that was very sturdy because this thing is definitely heavier than the average smartphone. I found the mount linked to below and have had it for a week and it is definitely very well made and I can't recommend it enough. It is pretty expensive however it is extremely sturdy and have multiple settings so that you can have it fit in portrait or landscape. There are some youtube videos that you can watch if you google the company name which is in the product listing.
Check out this item I found on eBay:
7" Tablet PC GPS Navigation Mounts cradle Holder for Galaxy Tab CAR Mount
Link: https://rover.ebay.com/rover/1/711-...dle-Holder-Galaxy-Tab-CAR-Mount-/270878136796
sent from my T-Mobile Samsung Galaxy Tab Plus
Check out this item I found on eBay:
7" Tablet PC GPS Navigation Mounts cradle Holder for Galaxy Tab CAR Mount
Link: https://rover.ebay.com/rover/1/711-...dle-Holder-Galaxy-Tab-CAR-Mount-/270878136796
sent from my T-Mobile Samsung Galaxy Tab Plus