MegawattSeat Back Tablet & Accessory Mount for Rivian R1S & R1T, Car Tablet Holder Mount. Securely Holds iPad Bracket, Go Pro Camera or Other Gadgets

Excellent construction and easy installation.

Fits the Rivian perfectly, exceptionally well made, but has one fatal flaw: the threaded stud is fixed to the bracket, so when you tighten down the tablet holder, it with tighten down at a random angle. I fixed it by adding a thin rubber gasket between this bracket and the tablet holder so that it tightens down in a suitable position. Every tripod I've ever seen has the threaded stud floating so it can twist and tighten at any desired position. If this needs a gasket, it should have come with one, but a floating stud would have been better. I emailed electruck4x4 and didn't hear back after a week.