Smart Electric Trailers Could Turn Freight Vehicles Into Rolling Control Networks

Heavy-duty freight electrification is usually framed as a story about batteries, charging networks and powertrain efficiency. A new Perspective article argues that this framing misses a more radical possibility: electrification could fundamentally change the architecture of the freight vehicle itself by turning the trailer, for more than a century an essentially passive box on wheels, into an intelligent, actively controlled part of the machine. The paper, published in the journal Discover Vehicles, introduces the concept of the Smart Electrified Trailer, or SET, a platform in which electrified trailer axles combine compact electric machines, wheel-speed sensing, local control electronics and communication systems to participate directly in vehicle-dynamics management.

The author, Luis E. Juanicó, argues that conventional diesel trucks concentrate propulsion, sensing and vehicle-dynamics control within the tractor unit, and that this concentration enforces a long-standing compromise between rolling resistance, traction and stability. Because diesel drivetrains are mechanically complex, propulsion is typically delivered to only a limited number of driven axles. Tires must then simultaneously provide propulsion, braking and cornering forces, a trade-off commonly described by the friction-circle concept, in which the combined longitudinal and lateral forces a tire can deliver cannot exceed the limit set by vertical load and tire-road friction. Reducing rolling resistance improves energy efficiency, but it can also reduce the grip available for acceleration, braking, hill climbing and safe operation in poor conditions.

Electric powertrains alter this design space in a specific way: additional driven axles can be added with relatively little mechanical complexity, and propulsion and braking forces can be distributed electronically across multiple axles. Spreading tractive effort over a larger number of contact patches reduces the longitudinal force required from each tire, freeing a greater portion of each tire’s friction circle for stability and cornering. The article notes that multi-motor architectures are already emerging in commercial heavy-duty electric vehicles, allowing torque to be allocated dynamically according to operating conditions, and that modern control systems continuously adjust torque distribution in response to vehicle speed, payload, road conditions and tire-slip measurements. In this framework, the author observes, traction management increasingly becomes a software problem rather than a purely mechanical one.

The efficiency stakes are considerable. Modern electric trucks such as the Tesla Semi have motor efficiencies that can approach 90 to 95 percent under typical operating conditions, whereas diesel trucks operate at substantially lower average tank-to-wheel efficiencies because internal combustion engines spend much of their working life away from their optimum efficiency point while also incurring losses in transmissions, differentials, auxiliary systems, idling and dissipative braking. As a consequence, a much larger fraction of an electric truck’s total energy consumption is associated with aerodynamic drag and rolling resistance. A simple estimate presented in the article suggests that aerodynamic losses may account for roughly one third of total highway energy consumption, leaving rolling resistance as one of the dominant remaining losses. Because heavy trucks operate with large axle loads and accumulate substantial annual mileage, even modest reductions in rolling resistance may generate significant energy savings.

This is where the trailer enters the picture. Conventional passive trailers rely exclusively on the passive mechanical properties of their tires to cope with disturbances such as crosswinds, slippery pavements, uneven roads or sudden load transfer, which is why heavy-duty trailers typically require relatively high-traction tire designs to preserve stability. A Smart Electrified Trailer equipped with distributed wheel-speed sensing, anti-lock braking, electronic brake-force distribution, traction control and independently controlled electric wheel motors could instead actively compensate for many of these disturbances. By reducing the dependence on passive tire characteristics alone, the author hypothesizes, such architectures may enable lower rolling-resistance tire designs without compromising overall controllability or safety.

The article is careful to label its quantitative claims as speculative. As an illustrative engineering scenario rather than a validated performance prediction, it proposes that reductions in the rolling-resistance coefficient on the order of 15 to 25 percent could potentially become achievable through future tire optimization enabled by distributed control, which might translate into overall energy savings approaching 10 to 15 percent depending on how much rolling resistance contributes to total vehicle energy demand. The author explicitly states that these values are hypothetical engineering estimates requiring dedicated vehicle-dynamics simulations and experimental validation. The paper also notes that comparable benefits would be harder to achieve in diesel trucks, where rolling resistance represents a smaller fraction of fuel consumption and extending traction to additional axles would introduce significant mechanical complexity.

The case for putting control authority in the trailer grows stronger as articulation increases. B-trains, double trailers and road trains introduce multiple articulation points that create complex dynamic interactions between vehicle segments, and these combinations may experience trailer sway, rearward amplification, rollover tendencies and jackknife events, particularly during emergency braking, rapid lane changes, strong crosswinds, steep descents or operation on low-friction surfaces. In such vehicles, disturbances generated at the tractor can propagate downstream and become amplified. Electrified trailer axles would allow corrective forces to be generated locally at multiple points along the vehicle: independent left-right torque control could generate stabilizing yaw moments, while coordinated regenerative braking could simultaneously recover energy and reduce jackknife risk. The benefits, the article argues, are expected to increase with vehicle length and articulation complexity, making long combinations promising candidates for early adoption.

The proposed SET differs from existing e-trailer concepts, which the author describes as primarily intended to provide propulsion assistance or onboard energy storage. The objective here is not to turn the trailer into an independent propulsion unit but to extend active control authority throughout the vehicle combination. Even relatively small electric machines may contribute to stability enhancement, yaw control and improved braking-force distribution. On the question of added mass, the article acknowledges that the architecture inevitably increases trailer tare weight because of motors, power electronics, sensors and communication hardware, but points to commercially available compact traction motors as evidence that the penalty can be small: BorgWarner’s HVH 146 permanent-magnet motor, for example, delivers 35 kilowatts of peak power while weighing only 14 kilograms and has been proposed for commercial-vehicle applications. Passenger electric vehicles commonly employ traction motors in the 70 to 125 kilowatt range, which would likely exceed the continuous power needed by an individual SET axle whose primary function is corrective torque rather than sustained propulsion. The author notes that future optimization studies should still evaluate the full trade-off between added hardware mass, payload capacity, stability improvement, recovered braking energy, operational safety and cost.

Beyond wheel-level dynamics, the concept extends to distributed perception. Cameras, inertial measurement units, articulation-angle sensors, tire-pressure monitoring systems, radar, lidar and other sensors could progressively extend situational awareness throughout the entire articulated combination. Current heavy-duty trucks frequently provide limited awareness of the rear sections of long combinations, and distributed sensing on trailer units could continuously monitor trailer position, wheel trajectories, road-edge proximity, cargo behavior and surrounding traffic. Such information could improve maneuvering in confined spaces, reduce the risk of trailer wheels leaving the roadway, enhance safety at roundabouts and tight intersections, and provide earlier detection of hazardous situations, supporting advanced driver-assistance systems and offering what the author calls a natural technological pathway toward future autonomous freight transport.

The article frames the Smart Electrified Trailer as the convergence of three research directions that have developed largely in isolation: integrated vehicle dynamics and chassis control, including anti-lock braking and electronic stability control; intelligent vehicle control for increasingly automated road vehicles; and distributed sensing and perception for driver assistance and autonomous driving. Extending the principles already used in these systems to every articulated unit, the author argues, creates opportunities for distributed closed-loop vehicle control that have received little attention in the freight electrification literature. The paper stops short of experimental proof: it is a Perspective, and its conclusions call for quantitative evaluation through vehicle-dynamics simulations, energy analyses, control-system development, hardware implementation and full-scale validation. But its central claim is clear. The next generation of heavy-duty freight vehicles may be characterized not only by electric propulsion but by intelligent distributed control, transforming trailers from passive cargo carriers into cooperative cyber-physical nodes that contribute to stability, energy recovery, safety and overall transport efficiency.

Subject of Research: A conceptual architecture for smart electrified trailers that act as distributed sensing and actuation platforms in heavy-duty freight transport

Article Title: Smart electrified trailers as distributed sensing and actuation platforms for heavy-duty freight transport

Article References: Juanicó, L. E. (2026). Smart electrified trailers as distributed sensing and actuation platforms for heavy-duty freight transport. Discover Vehicles, 2(1), Article 47. https://doi.org/10.1007/s44465-026-00051-y

Image Credits: AI Generated

DOI: 10.1007/s44465-026-00051-y

Keywords: heavy-duty freight, electrification, smart trailers, vehicle dynamics, regenerative braking, rolling resistance, distributed sensing, autonomous freight, B-trains, electric trucks, stability control, cyber-physical systems