Mobile Operation

Mark, We have some experience with video in Fair Lawn during parades and there were some dropouts, but was functional. It would be good to retry that with an all MIMO network. I have tried three configurations, a Bullet with 6 db stick, and a Rocket with dual sticks or a MIMO antenna. The latter two were more reliable when moving or fixed. I need to find a 6 db MIMO short antenna as I suspect that it may be more reliable than the dual sticks. The question is whether it justifies the cost. It might be interesting to compare your 2.4 Bullet with a 900 MHz Nanoloco with an external stick antenna in a mobile setup. We've ignored 900 MHz for user access when mobile or portable, and it may offer some improvement in propagation vs. that of 2.4 GHz. Experience with reachability in comparable cellular bands suggests that it might be worthwhile.

Our Landops group has done some testing in Southern California desert area and there are a few YouTube videos.  No specific data shown to answer your questions.
I have set aside two Rocket XM M5 radios to experiment with this.  There are two vertical OMNI MIMO antennas I’ve looked at, both costly, both fairly high gain.  In the horizontal plane, one has a 5 degree up angle lobe and the other looks flat.
I am very interested in experimenting with this but have not jumped at buying those antennas since the cost is significant.
I would like to try this in various terrains and driving conditions.