I wanted to send you a photo of the car rig in use. I used a heavy duty ball head and lots of towels/gaff tape to take away cabin noise. Freeway speeds, no problem. The cups did pop off while it was attached to the side window, straps totally saved my T3i.
Scott sez: I like how J beefed up the mount, proving the rig can handle a larger camera. He was also wise to use the straps, which saved him from totaling his DSLR. Nice work!