RIGHT HAND thread but a bas**d to undo so use a half inch drive and a three foot long bar, and a mate standing on the back brake and laying over the seat should do it.
Be careful not to slip off the nut.
We ground off the face of the socket to get it to sit on the nut all the way, and if it still doesn’t budge then heat up the inside of the wheel spindle with a blow torch, not to much mind.
