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This technical paper continues a sequence of previous SAE Technical Papers that document progress of wheel bearing adjustment on tractor/trailer combination vehicles. In an earlier SAE paper, 2000-01-3496, misinformation provided was recognized. This material is reviewed following the conclusion of this technical paper and corrections are offered. However, of primary importance, disclosure will be made of new developments accomplished in wheel bearing preload adjustment procedures since December 2000. The intent of this paper is to advise the means by which selected amounts of preload can be introduced into trailer wheel assemblies. These are identified as axle nut adjustable systems that are serviceable by mechanics in commercial carrier fleet operations. No commentary will be presented relative to the permanent type of wheel bearing adjustment systems that are factory installed and are unable to be adjusted while in service.