I need information on a new, multi-level, stackable parking system.
With this new parking system you can stack several cars (usually 2-4)
one on top of the other (using hydraulics) so that you can park more
cars into a given space. Basically what I?m looking for is a list of
all the manufactures of this product that you can find. I need basic
company info as well as contact information in addition to any
information you feel is relevant.

HI,
If you want "all" such parking systems, Researchers may be shy of
attempting an "answer".  (Only Researchers  - blue names -  can post
an official answer.  This is a free comment.)
If you limit the number of manufacturers that you need, you will be
more likely to get an answer with the additional information.

Here are a couple of sites, no attempt to ensure contact information:
http://www.djc.com/news/co/11149494.html
http://www.multiparking.com/index.php?id=4&L=1
    (Another site mentioned that Klaus, a German firm with internation sales, is
     the leader in the industry.)
http://www.wohr.de/engl/source/frameset.htm
    (Click on "sales" and "international" and "USA" in the window for contact.)

Good luck.