I had that problem with my Carry Freedom trailer.
I fixed it with a bit of lateral thinking.
My skewer nut is in two parts.
A metal inner core covered by a plastic outer.
I prised the two parts apart and replaced the metal inner the wrong way around.
Not only did this move the thead a good 10mm inwards but it also gave a step for the hanger to sit on.
This means that if the hanger slips under hard braking if prasses on the nut, not the skewer.
Luck ...........