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Independent engine maker Cummins Inc. extended its lead as the primary supplier to the North American heavy-duty diesel truck market last year, growing its market share to 40.4%, from 39.1% in 2011, WardsAuto.com reported.

Cummins Inc.’s fourth-quarter operating profit and sales fell on weaker North American trucking and construction markets, the engine maker said Wednesday.

Eaton Corp. said Tuesday its fourth-quarter earnings fell 50% on charges related to its $13 billion acquisition of Ireland-based Cooper Industries.

Used Class 8 truck sales declined in December from a year earlier as vehicle prices increased and average mileage trickled lower, according to ACT Research.

Meritor Inc. reported a loss for its fiscal first quarter, citing weaker conditions outside of North America.

LAS VEGAS — Fleet executives said they are turning to the aftermarket to avoid potential parts shortages and also are finding value in performing more maintenance in-house.

American Trucking Associations said Wednesday it has added the electronic weigh station pre-clearance system, Drivewyze PreClear, to its group of featured products for the trucking industry.

WASHINGTON — Federal Motor Carrier Safety Administration officials said they are planning to release at least five new proposed or final rules in 2013, including a supplemental proposed electronic logging device rule and a proposed drug and alcohol clearinghouse rule by the end of March.

Michelin North America announced a C$73 million expansion to its truck tire plant in Waterville, Nova Scotia.

Two trucking industry component suppliers disclosed their preliminary 2012 results this week.