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The major reason I would consider Tapered Roller Bearings (TRB's) is because of stiffness and deflection.... Load could also be an issue but I'm not worried about that as I don't think our trucks are really taxing the load rating of these bearings.
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There is some argument for TRB there. Stiff sidewall bias ply tires were prone to slide across surfaces reducing side load in turns. Radials do not behave the same. Additionally a truck like ours was much more likely to operate on a dirt road when new. I suppose, these days, we rarely hear about trucks losing wheels due to bearing failure and most folks with mildly upgraded trucks probably aren't pushing the vehicle's limits. I know some folks who still run original type bearings in vintage stock cars but "racer knowledge" says larger spindles and hubs, which come with TRB's, are a must-have for hard play.