I am thinking when I post a question, I should also post the solution, should I find one. Why? Maybe some future busnut might be looking into the same problem.
I asked you all for input on my extremely wobbly entry steps.
(See original post and replies here: http://www.busconversions.com/bbs/index.php?topic=20790.msg227045#msg227045
Well, my welder friend found the problem. The rear steel was #16 sheet metal. He replaced it with 1/4-inch steel plate. Now there is only a very tiniest wobble, hardly noticed.
The first picture is the NEW metal, and the second pix is the OLD steps.