Jack up one side at a time and spin the wheel listening for noises and feeling for any play in the bearings or roughness. Yes, the Dexter recommendation is 12 months or 12,000 miles, that is their recommendation for insuring their axles will outlast the warranty.
BTW, the hardest thing on wheel bearings is making very tight turns, it places a tremendous side-stress on the entire wheel. You are aware that most ST tires have a 65MPH speed rating, right.
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2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA. "We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln
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