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Id venture to say either the wheels were never properly torqued during the "professional" install, torque wrench value not correct, no 3 step torque sequence values were adhered to..
Also 3 years since install... when was the last time the hubs were removed to inspect brakes, bearings, etc
A good torque wrench should be standard equipment for all RV owners.. You can then do the task of rechecking wheel lug nut torque yourself and know its done right
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