hydraulic gangway for hunter 456 passage CC

[nmenkes]

I want to install a hydraulic gangway on my Hunter 456 456 passage CC 2004.
I need a length of 2.5 to 3.0 Mt., lifting weight under 100 Kg,
gangway weight under 150 Kg.
my concerns are :
added weight on the stern, SS or Aluminium, manufacturer selection.

Please give me recommendations, comments
and anything you think is relevant

Nahum