I had a hell of a time when I did mine -
I used the socket, AND a board through the wheel, AND a torch to heat up the nut/shaft enough to get it to suck in penetrating oil, AND a 3/4" drive wrench with a 4 foot cheater bar. (individually none of these worked)
when it finally popped loose I thought I'd broken something.
thankfully that should never happen again and it should be easy next time with the impact gun.