On a Honda EU7000Is generator. Can you combine the L14-30 on the (120/240 side) and....one of the L5-30 or 20amp (120 only side)....to increase amperage to 50amps?
The parallel kit is used to hook up two eu7000 generators.I believe what you need is a "Parallel kit" for eu7000.
They say it exists on this page: http://www.mayberrys.com/Honda/generators/eu7000.aspx
Call them:
http://www.mayberrys.com/ContactUs.aspx