What do you mean by spindle hanger? The bracket on the frame that the kingpin goes through to hold all the spindle stuff together? The flat part almost parallel to the ground that the tie rod ends connect to on the spindle itself? The part on spindle the brake caliper connects to? Something else? And what am I specifically looking for?
yes, I specifically meant where the kingpin goes through the frame, and how square that is with the frame, and if there’s any difference left to right.
I think the suggestions thus far cover most of what i’m saying, too – cracks, bends, etc.
As for checking the spindle bearings, I would remove the spindle and check the bearings through which the kingpin passes. Make sure they aren’t binding, or knocked out of whack somehow.