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Wheel bearing are easy enough to check. Grasp the tire at the 12 and 6 o'clock positions and attempt to rock the tire. If you feel any play, the bearings are loose and need to be replaced. Also, rotate the tire by hand. Any roughness or noise from the bearings would also tell you the bearings are worn or damaged and need to be replaced.
Now the thud noise sounds like guide rods.
Other items worth considering as noises can travel - motor and transmission and exhaust mounts
My .02
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