Tom,
It goes without saying you are extremely generous with your time and knowledge. Although we have never met, and I hope we do someday; you have gone above and beyond in your dedication to educating me. A clear step by step technical yet articulate presentation.
It will be a few months before I tackle the second level of the liftgate but be assured your explanation will be my structural guide. In the meantime, your explanation and technique will greatly help me as I need to deal with a lot of 2nd level platforms that will not easily be secured to the wall and will be free standing. These platforms will carry a 4 track mainline 10 inches above the base table.
I believe your description is a very valuable primer on free standing platforms.
I may ask your help again. Although I love problem solving, I like it to work right the first time, even more.
I also want to thank GRG for the help on dealing with the Mianne lift and a slight issue regarding adjustment of the lower limit.
kevin