[A/S] WTD: umbilical converter "banana"

[schuetzen - RKBA! <chasm@xxxxxxxxx>]

I am looking for a round pin to a flat pin converter.
I really do not want to have to disassemble my umbilical or even, replace the
male plug on the wall of the trailer.  Does anyone know if such an animal is
made?  I would need a double male I think.  flat on one end, round pin on the
other.  or, are round pin plugs still being made??  if so, I will just make my
own.  if that is the case, where can I buy umbilical cable in bulk.. might as
well make a long one for charging my trailer batteries without having to back up
to the trailer.  

thanks
chas