All of the products (including the 2x4 and C-clamps!
) mentioned seemed to do the job from the reports made so far. I am leaning to ordering the SteadyFast for two reasons:
(1) there are only three clamps to tighten or loosen, meaning less to do on setup and teardown, and
(2) it just seems logically stronger to anchor the brace to a footplate rather than the landing gear or scissor jack itself. (Maybe no difference, but certainly no weaker.)
One thing for sure, everyone agrees that anything is better than nothing if the s-h-a-k-i-n-g bothers you. Really do appreciate all the comments from everyone!