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JMHOpinion, but, assuming you have the larger opposed Timken style bearing hubs with applied pre-load torque, my guess is all manufacture related faults in 3 categories; 1/bad bunch of chinese bearings. 2/ Incorrect pre-load set during hub assembly. 3/ Forgot to load hubs/pack bearings with required amount of lube.
There can be any number of other causes for this situation but would not suspect mis-alignment or suspension setting issues being among them as your trailer is relatively lightly loaded and the tires would show effects of these conditions long before those humongous bearing sets ever did. Those hubs represent a quantum leap forward in trailering technology in that they put the relatively light duty of RV usage on similar types of hubs as the commercial traffic uses with all of the torsional stresses being borne on the centerline of the wheel/hub combo.
Lippert sending a tech'y to assist you shows how concerned they must be as they have a lot riding (pun not intended) on those hubs being a failure resistant component.
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Sandra, Bruce
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