http://www.hayes-lemmerz.com/products/html/aftermarket.html and specifically: http://www.hayes-lemmerz.com/products/html/hydraulic.html http://www.draw-tite.com/prodinfo/products/p04_s01.htm Take a look at the Activator III
and specifically:
http://www.hayes-lemmerz.com/products/html/hydraulic.html
http://www.draw-tite.com/prodinfo/products/p04_s01.htm
Take a look at the Activator III