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The U.S. heavy-duty truck fleet grew to its largest size on record during the first quarter and is likely to grow further in the coming quarters, IHS Automotive reported.

New trailer orders rose 20.2% in April from a year earlier, ACT Research reported, as more fleets begin to add equipment, rather than just replace existing units.

Diesel particulate filters, a key element of truck emissions systems since 2007, can present fleets with problems if they are not routinely maintained along with the truck’s engine, experts said.

The final generation of diesel truck engines manufactured by Caterpillar Inc. has generated yet another civil lawsuit, this one filed by Minnesota carrier Scenic Boundaries Trans Inc.

Cummins Inc. Vice President Jeff Jones will complete a 37-year career with the independent engine maker, retiring at midyear, the company said May 8.

Drivewyze Inc. said Texas has added its PreClear bypass service at the state’s six busiest weigh stations and plans to activate service at 51 additional locations and 17 mobile sites within a month.

Large fleets with massive stocks of tires to maintain need a lot of tools. But the most important tool — data — is often missing, fleet managers and tire makers said.