Albion - no unfriendliness was intended. This forum at one time used to be frequented by very experienced Grips who took the time to answer questions from beginners.
We generally answer to try and help out.
I only replied to your direct comment " Most "regular" rigs use suction cups" and then "Everytime I have ever rigged or seen a Red or Alexa to the side of a car it has either been a window jam "hostess tray" mount or sunction cups with baby pins and C arms connected to some platform which the camera is mounted. my personal experience has been on smaller shows but this includes just seeing pictures as well from big US productions....its the generally the way its done as far as I know"
I find that relying on suction mounts to be unsafe, which is the ONLY reason I replied at all.
This was not to be unfriendly, but to limit the potentially endless debate of how such and such person does it on such and such show.
Obviously, this is my opinion, and the way I would choose to work. You can do rigs with suction only. In order to make it safe enough to be acceptable to me would be extremely complex.
Remember that a camera that comes loose at speed is not just an equipment loss. It is also a missile with considerable mass and velocity.
Be safe and hire people who know what they are doing.
Peace - Sanjay Sami