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Trailer maker Wabash National Corp. said it is exploring strategic alternatives — including divestitures, changes to its capital structure and a merger or a sale — following a default under a revolving credit agreement.

The U.S. diesel average inched up last week 0.7 cent a gallon to $2.228, following two weeks of major increases, while the gasoline price dipped, the Department of Energy reported.

U.S. retail diesel prices jumped sharply last week, a second straight bump that raised the national average a two-week total of 20.4 cents a gallon, or about 10%, as gasoline also rose, topping the $2 a gallon mark for the first time since November, according to the Department of Energy.

Rising oil prices and growing distillate demand pushed the U.S. national diesel average 7.3 cents higher to $2.09 last week, the first increase in more than two months, the Department of Energy reported.

The U.S. Environmental Protection Agency last week took the first step toward creating a national cap-and-trade system, proposing a new rule that would establish a federal system for reporting carbon dioxide emissions and other greenhouse gases produced by large stationary and mobile sources.