Trailer Box

The cargo inside a trailer is often far more valuable than the truck itself. Yet, when a trailer is disconnected and parked, critical operational data is usually lost. With the smart Squarell Trailer Box, you stay connected to your trailer and its valuable data — anytime, anywhere.

Squarell Trailer Box mounted on a trailer, providing GPS tracking, trailer monitoring, CAN bus data collection, and real-time telematics for fleet management.

Complete visibility of your trailer

Trailer Box provides real-time insight into trailer location, status, and maintenance.

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Smart truck-trailer recognition technology solution

Trailer Box automatically recognises trucks and monitors trailers, even when detached and parked.

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Trailer data collection across company branches

Squarell Trailer Box provides real-time trailer data for smarter fleet management.

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Squarell Trailer Box device for trailer telematics and data connectivity

Complete visibility of your trailer

The Trailer Box continuously collects and transmits essential trailer information, even when the trailer is detached from the truck. This provides fleet operators with real-time insight into the status, condition, and location of both trailer and cargo.

The system can monitor and transmit data such as:

  • GPS/GNSS location tracking for fleet management and theft prevention
  • Cargo weight, vehicle weight, and axle load information
  • Vehicle Identification Number (VIN) and mileage
  • Tire pressure monitoring and air pressure data
  • Braking system and maintenance information
  • Chassis configuration, axle count, and axle positions
  • Road behaviour insights, including brake and tire usage
  • Cooling unit performance and status

By keeping your trailer connected at all times, the Trailer Box improves operational efficiency, reduces downtime, enhances security, and helps optimise maintenance planning.

Smart truck-trailer recognition technology solution

The Trailer Box automatically recognises connected trucks when equipped with a Squarell Bluetooth Beacon. This prevents incorrect trailer coupling and helps avoid costly operational errors, delays, and safety risks.

Always connected, even when disconnected
Every Trailer Box comes standard with an integrated battery pack. This allows the system to continue sending periodic “heartbeat” signals when the trailer is disconnected or parked. You always know the trailer’s location and receive alerts if unexpected movement is detected, helping protect valuable cargo against theft.

For extended autonomous operation, an optional second battery pack is available.

Close-up of the Squarell Trailer Box installed on a trailer chassis, featuring electrical connectors, CAN bus interfaces, cables, and telematics hardware for trailer data collection and tracking.
Illuminated semi-trailer truck driving on a highway at night under a dark blue sky.

Trailer data collection across company branches

Smart fleet management starts with reliable trailer data. With the Squarell Trailer Box, companies gain real-time insight into trailer location, condition, usage, and cargo status across all branches and operations.

  • Trailer Rental Companies gain visibility into how rented trailers are used.
  • Logistics Companies can track trailer location, condition, and utilization in real time.
  • Freight Operators benefit from monitoring cargo movement and trailer status.
  • Agricultural Businesses can ensure goods are transported under optimal conditions.
  • Cold Chain Providers can monitor trailer temperatures and safeguard product quality throughout transport.

The solution is simple: the Squarell Trailer Box collects data from multiple trailer systems and sensors while generating valuable telematics insights itself. The result is smarter fleet management, better operational control, improved security, and maximum trailer uptime.

Frequently asked questions

According to the ISO11992 standard, no additional CAN devices may be connected directly to the point-to-point CAN bus between the truck and trailer. The Trailer Box complies with this requirement through a dedicated branch in the power cable, where all original wires continue uninterrupted. This branch powers the Trailer Box and connects the CAN wires to electrically isolated CAN sensors, ensuring safe and fully compliant operation without interfering with truck-trailer communication.

We offer six apps in two variants: T1 is designed for 95% of trailers used as single trailers, while users with a ‘road train’ can also receive data from the additional trailers via the T2-T5 apps.

Available Apps:

The Trailer Chassis Data T1
Trailer Chassis Data T2-T5
Trailer Brake Data T1
Trailer Brake Data T2-T5
Trailer Cargo Data T1
Trailer Cargo Data T2-T5
Trailer Diagnose Data T1
Trailer Diagnose Data T2-T5
Trailer Drive Data T1
Trailer Drive Data T2-T5
Trailer TPMS T1
Trailer TPMS T2-T5

Trailer ID App

The Squarell Trailer Box continuously collects and transmits essential trailer data, including GPS location, tire pressure, axle load, braking status, and cooling unit performance. Thanks to the integrated battery pack, the system remains active even when the trailer is disconnected or parked. This allows fleet operators to receive real-time updates, heartbeat signals, and alerts in case of unexpected movement, helping to prevent theft and improve operational efficiency.

The Squarell Trailer Box supports smarter fleet management by providing real-time insight into trailer location, usage, condition, and cargo status. Trailer rental companies gain visibility into how their trailers are being used, logistics companies can optimize trailer utilization and condition, and cold chain providers can monitor temperatures to safeguard product quality. This results in reduced downtime, improved security, and more efficient maintenance planning.

Specifications

• Brand independent trailer monitoring system
• Versatile solution to watch over your trailer and cargo
• Quick installation due to the short power extension cable
• Non-intrusive CAN reader guarantees a point to point CAN bus
• Compact GPS/GNSS data with high location accuracy on the map
• Bluetooth receiver for identifying the truck beacon and TPMS
• G-force sensor for safety information and Event Data Recorder
• 4G GPRS modem with 2G fall back with MQTT protocol
• 3 similar connectors for connecting different data networks like:
– CAN (to connect to T-CAN)
– RS232 (to connect to the cooling unit)
– 1-wire (to connect to temperature sensors)
– SFD (for example to connect the Power Output Module)
– 1 analog input (to connect to door contacts)
• One (or two) battery packs for location heart beat & tamper warning
• LED panel with button activated LEDs for:
– Power
– Modem connection
– Software
– Bluetooth status
• Rugged waterproof IP67 and UL94-VO box and connectors
• The USB port and SIM card can be reached through waterproof caps
• Applications (Apps) for single trailers or road trains:
– Chassis data
– Cargo data
– Drive data
– Brake data
– TPMS data
– Diagnostics data
– Usage data

Relevant items

Worried businessman scratching his head while standing in front of a row of parked white semi-trucks under a cloudy sky.

Trailer monitoring: why it has become essential for modern fleet management

Trailer monitoring helps fleet operators gain visibility into overlooked trailer assets, including brake performance, cold chain control, security and utilization. Connected trailer data supports safer, more efficient and more compliant fleet operations.

Infographic of six fleet management benefits—efficiency, uptime, safety, compliance, trailer monitoring, and EV performance—illustrated with trucks, a van, a trailer, and an electric bus.

One data language for every vehicle in your fleet

Squarell Technology has launched a new website structure that, for the first time, explicitly tells the market what the company has been doing for two decades: translating technical vehicle data into reliable intelligence for fleet operators, telematics service providers and platform builders worldwide.

A trailer data collection device can gather information about the weight and temperature of the cargo, the VIN number, the mileage, the doors, the tire pressure system, maintenance, GPS location, behaviour on the road, theft during parking, the braking system, and the cooling unit.

Trailer Box

Gain full visibility into trailer usage with Squarell’s Trailer Box. Track movements, identify towing vehicles, and access valuable data insights to optimise fleet performance.

Logo reading “expert view” with stylized blue “X” and “V” and black lettering on a light background.

ExpertView has moved

We are excited to announce a change to the device management platform, ExpertView. Over the past year we have worked hard to update the website with better technology.

Together, Prometheus and Squarell provide real-time insight into axle loads for Long Heavy Vehicle combinations, giving drivers and planners more flexibility and compliance confidence on the road.

Real-time insight into the axle loads of Long Heavy Vehicles (LHV)

Together, Prometheus and Squarell provide real-time insight into axle loads for Long Heavy Vehicle combinations, giving drivers and planners more flexibility and compliance confidence on the road.

Ready to turn your data into results?

Discover how Squarell helps you reduce downtime, improve maintenance decisions, and create measurable impact from deep vehicle data.

Ready to turn your data into results?

Discover how Squarell helps you reduce downtime, improve maintenance decisions, and create measurable impact from deep vehicle data.