Check this list off:
Kingpin bearings tight.
felt and Knuckles seals not leaking
Tie rod ends tight
U-bolts tight
Spring bushings have no excessive wear
Check steering gear box play
Are gear box mounting bolts tight
Are leaf springs in negative arch
If spoa, check for correct pinion angle.
if you have wheel spacers, check if they are tight
Are the wheels balanced correctly
Is it properly aligned
And lastly, is the axle housing bent