I just had the same thing happen to my trailer last fall. and they cut off the damaged spindle and welded on a new one same day. Has been running excellent ever since.
had this happen on the road.. A welder from Seymour Tx
came out to the road and welded a new one on ..4 yrs later it was still straighter than the other side..
Any GOOD welder with a new spindle can fix it...