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Dual tires that do not match
A dual set is two tires on one end of an axle. They are meant to share the load. When one tire is lower than the other, the taller tire carries more of the weight, runs a different radius, and scrubs the pavement on every mile. The truck no longer drives balanced. Drivers feel that as a pull, a shake, or a lane that takes constant correction. From the side of the truck both tires can still look full, which is why a glance at the yard is a weak check.
The mismatch starts small. A slow leak, a valve that was not seated, a cold morning, or a tire that was set by feel instead of a gauge. Once the pair is apart, the gap tends to grow. The loaded tire flexes more, builds heat, and loses more air. The lighter tire is along for the ride, wearing in a different pattern and doing less of the work it was put there to do. On a drive axle that shows up as uneven tread and a truck that wanders. On a trailer it shows up as a tire you discover at the dock, already too far gone to finish the week.
Safety is the first reason this matters. A dual that is not equalized is not carrying the load the way the axle was set up to carry it. Heat in the overloaded tire is the failure drivers talk about after the fact: a tire that looked acceptable at dawn and is shredded by afternoon. Equal pressure between the two tires is how that pair stays a pair. A system that only tells you a number after you have already stopped is late. The check has to travel with the truck.
Security is knowing, not guessing. A driver who can see low pressure, high pressure, and temperature from the cab does not have to wait for a vibration to become a roadside stop. When the display stores the date and time of the problem, the shop and the next driver are not reconstructing the story from memory. Truck positions and trailer positions are different ends of the same job. A tractor can be healthy and the trailer can still be the one that takes the truck out of service.
Value is the tires, the time, and the load. A dual destroyed by mismatch is not a cheap tire. It is a delay, a service call, and a trailer that misses a dock. Fleets already pay for air, gauges, and pre-trip time. What they often do not have is a way to keep the two tires of a dual at the same pressure while the truck is moving, and a record of when a problem showed up. That is the gap between a yard check and a truck that stays balanced on the highway.
The TPMEQS Greenbox is a tire pressure monitoring equalization system for commercial trucks and vehicles with dual wheels or single wheels. On a dual, the wireless transmitter connects both tires, equalizes pressure between them, and monitors low and high pressure. The film shows the sensor bar fastened across the hub on the existing wheel bolts, one hose with a curved fitting and one with a straight fitting, each meeting a valve stem. The display in the cab stores the date and time of a low-pressure, high-pressure, or temperature problem. The current site also calls the kit an all-in-one package and says it is built in the USA. Those two lines are claims from the site. The film shows the parts together and does not repeat the USA line.
Install time in the film is about five minutes for one sensor and about forty minutes for the truck. Trailer installation is very similar. The monitor face is marked for truck positions 1 through 6 and trailer positions 1 through 4. A repeater sits inside the steering-axle wheel. The driver places the receiver where it can be seen in the cab. In one moment of the film the cabin screen reads 104 PSI and 53°F. That is a reading in the video, not a published range.
Every truck and every trailer needs this for safety, security, and value. Safety is pressure maintained and equalized so the truck drives balanced. Security is the cab, and the date and time of a problem. Value is one kit for the tractor and the trailer, put on in the time the film describes. If your duals are still checked by eye, that is the conversation to start.
Tell us how many trucks you run and whether you need the tractor, the trailer, or both. Someone replies about your trucks. If the form does not go through, the page keeps what you typed and gives you a direct email to customersupport@truckstpms.com.
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Every truck and every trailer needs the Greenbox for safety, security, and value. Send a note and someone replies about your trucks.