Daimler Trucks is not optimistic that supply chain constraints will improve anytime soon to clear up ongoing shortages that have interrupted commercial vehicle production over the past 12 to 18 months amid record demand.

Independent engine maker Cummins Inc. supplied the most Class 8 diesel engines overall in 2018, and set a record for its heavier-displacement units used in one of the strongest years on record for new truck demand, WardsAuto.com reported.

Class 8 orders for January fell to 15,800 as backlogs already stretch out through the end of the year, according to ACT Research Co.

Independent engine maker Cummins Inc. reported higher net income and set a record for annual revenue, led by gains in North America.

Daimler AG, citing regulatory and trade headwinds, reported a decline in net income for the fourth quarter and full 2018 while revenue inched up in both periods amid an all-time record for global truck sales.

LAS VEGAS — Suppliers of a variety of products and services for the aftermarket announced developments here during Heavy Duty Aftermarket Week.

LAS VEGAS — Wabco North America plans to roll out, beginning in the third quarter, a network of certified independent service centers to support trucks and trailers using its parts.

Volvo Group reported fourth-quarter revenue rose as net income fell, while higher worldwide truck orders and deliveries increased both revenue and net income for the full year.

Power management company Eaton Corp. reported increased revenue for the fourth quarter and full-year periods, while net income declined in both.

Trailer maker Wabash National Corp. reported revenue increased in the fourth quarter and set an all-time record for the full year, annual shipments were at near-record volumes, but net income dropped in both periods.