One very important point to consider here is the type of folding table you are using. Most of the full time Buskers I know prefer a waiter's table in that they tend to be sturdy and easy to fold as well as set into place.
The other option I know of, are the prop tables that "appear". Harry Anderson used to have one and if I remember right, it started off as a magic poster then opened up. Of course the old Cane & Top Hat tables are quite cool depending on your style.
Another point on the tables is the kind of top you use. If you are fortunate enough to have an in-door or semi-sheltered site the old Black-Art well tables are awesome for busking simply because it's an old technology few know of now days so it comes off as "new"... they are just a music stand base which makes them easy to move around.
I'd suggest you look up Danny Hustle @ the Busker's Cafe or get in touch with Whit Hayden or even our own Mark Lewis in that these are people with a considerable bit of experience in and around that kind of work who can give you better guidance than I.
