Commercial vehicle supplier Meritor Inc. reported weaker results for its fiscal second quarter.

Five more trucking and logistics companies have announced weaker results, capping a first-quarter earnings season when the slow freight market led more than two-thirds of publicly traded companies to produce lower results year-over-year.

USA Truck Inc. reported a restructuring-related loss of $1.8 million, or 19 cents, as trucking and logistics performance was affected by the tough freight market.

Quarterly earnings reports last week were divided between four logistics operators that reported improved operating results and four truckload fleets whose profits fell due to pressure on rates and minimal freight shipment growth.

YRC Worldwide Inc.’s first quarter net loss narrowed to $12.0 million, or 37 cents per share, while earnings declined 3.6% to $60.3 million, or 72 cents, at LTL competitor Old Dominion Freight Line Inc.

Earnings performance generally was weaker at the five companies that announced earnings on April 27 in a freight market described by one of the reporting companies as “difficult.”

Booming sales of dry and refrigerated vans enabled trailer maker Wabash National Corp. to post first-quarter records for sales and operating income as well as gains in net income and earnings per share, the company said April 26.

Stronger supply chain and dedicated unit profits helped Ryder System Inc. to raise net income 5% to $56.2 million, or $1.05 per share.

The initial round of first-quarter truckload earnings sounded a negative note, with three of four large carriers reporting weaker results in a tough freight environment.