The truckload industry continued to struggle in the second quarter and earnings are expected to be down year-over-year for most carriers, based on forecasts from industry analysts and interviews with several fleets.

The share prices of trucking companies have been on the upswing since mid-May, recouping some of the gains from the bustling start of the year that were lost during a weak spring. While carriers generally are trading higher than a year ago, investors are once again waiting for clarity on the state of the U.S. economy before they send stocks soaring — or plummeting.

ArcBest Corp. released second-quarter results through May in its less-than-truckload and third-party logistics divisions with strong results in most categories.

The disappointing first quarter continued as three more truckload companies reported lower bottom-line results than a year ago, blaming the still-abundant capacity and a poor contract rate environment.

Three leading commercial vehicle suppliers notched quar­terly gains in net income and revenue for the period ended March 31, while a fourth sup­plier posted declines in both ­areas but expressed optimism that its financial performance would improve later this year.

Landstar System Inc. reported record first-quarter revenue and earnings per share, and net income climbed.

Volvo AB posted first-quarter gains in earnings and profitability, most of which was generated by its construction equipment division, as the larger truck division was fairly static compared with the same time in 2016.

Transportation and logistics companies begin announcing first- quarter results this week, as analysts predict truckload profits will be lower than 2016 and less-than-truckload and third-party logistics companies will have mixed results.

Universal Logistics Holdings Inc. reported net income plunged 71% in the fourth quarter of 2016, although the results were in line with the lower adjusted forecast that the company issued in early February.