The plastic bracket to mount the FT8900 head is a little flimsy and I’ll be removing it when I have the vehicle parked at home so I started looking for a more durable solution.  I ended up using a tripod ball head with a quick release shoe.  I found an inexpensive medium sized ball head from cowboystudio on amazon.  I purchased a pair so I can have one base installed in my car and one on my desk at home.

The head makes a solid mount that I can remove in about 10 seconds.