America’s trucking industry is getting squeezed from both sides, and for some smaller operators there simply has not been enough money left in the middle. At least 16 trucking, delivery, and transportation companies entered bankruptcy proceedings in less than a month between late August and September 21, underscoring just how difficult the freight business has become. The companies range from tiny operations to regional carriers such as Texas-based Xoco Transport, which operates more than 40 tractors and employs roughly 65 drivers. The filings arrive as diesel prices have climbed to extraordinary levels, with the national on-highway average recently reaching about $6.53 per gallon.

That number becomes especially painful when you consider how much fuel a Class 8 truck consumes. Filling a pair of large diesel tanks can suddenly turn into a four-figure expense, and doing that repeatedly across an entire fleet can chew through operating cash with surprising speed. Fuel has always been one of trucking’s largest variable costs, but carriers can usually compensate when freight rates rise with it. That has not consistently happened this time around. Smaller fleets and owner-operators have been particularly vulnerable because they often lack the pricing power, fuel purchasing programs, and sophisticated surcharge agreements available to the industry’s largest carriers.

The problem runs deeper than what drivers are paying at the pump. Freight demand has remained uneven, while insurance, equipment, maintenance, labor, financing, and other costs continue to put pressure on margins. That leaves some carriers moving loads at rates that look acceptable from the outside but generate very little profit once every expense is accounted for. A truck that is rolling is not necessarily a truck that is making money. For an independent carrier already operating on thin margins, an unexpected jump of several hundred dollars in weekly fuel expense per truck can quickly become the difference between staying current and falling behind.

The recent bankruptcy filings also illustrate an important distinction. Bankruptcy does not automatically mean that every company involved has closed its doors. Some carriers filed Chapter 7 cases, which generally involve liquidation, while others sought Chapter 11 protection and may attempt to reorganize their debts while remaining in business. Still, the broader trend is troubling. When smaller trucking companies disappear or reduce their fleets, the industry loses capacity. If enough capacity leaves the market while freight demand remains steady, shipping rates can eventually rise, and those added transportation costs tend to find their way into the prices consumers pay for groceries, building materials, auto parts, appliances, and countless other goods.

There is no quick technological escape hatch, either. Battery-electric heavy trucks continue to improve, but replacing diesel equipment across the nation’s freight network is an expensive and complicated proposition. Long-haul operators have to consider vehicle purchase prices, payload, range, charging time, charger availability, and whether suitable infrastructure exists along their routes. Large fleets may have the resources to experiment with electric trucks on predictable regional runs, but an owner-operator struggling to cover this month’s fuel bill is unlikely to solve the problem by purchasing an expensive new electric tractor. Diesel remains essential to American freight transportation, which means volatility in fuel prices can immediately ripple through the economy.

The current situation is another reminder that trucking operates on margins far thinner than many consumers realize. Diesel prices briefly approaching $6.53 per gallon are painful for anyone driving a pickup or diesel SUV, but for a company burning thousands of gallons every week, the numbers can become brutal. The wave of bankruptcy filings may involve relatively small carriers individually, yet together they serve as a warning about the financial health of the freight system. If fuel remains expensive while freight rates and demand fail to keep pace, the industry could see more small carriers reach the same difficult conclusion before conditions finally improve.