Two things come to mind. (1) There is a special tool needed for the axle nut. (2) The axles are supposed to be a press fit in the bearing. If there's signs the axle has been spinning in the bearing race, if its loose & pulls out without using a press, this has to be repaired.
The rear axle bearing is actually 2 bearings held apart by a spacer. Wilkinson sells a replacement that uses a thicker bearing and a narrowed spacer.
Setting the height of the rear suspension so the half shafts are parallel to the ground will reduce the rate of rear wheel bearing & u-joint wear.
-G
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