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Trailer positions 1 through 4
Four trailer positions are printed on the handheld in the film, right beside six truck positions. That layout is the product telling you the trailer is not an accessory. Positions 1 through 4 are how a driver names a trailer tire without pointing at a whole side in the dark. If those buttons are never learned, the trailer is cargo. If they are learned, the trailer is part of the same pressure system as the tractor.
Learning is a control on the device, next to Pre-trip. The film includes Learn because a sensor on a hub is anonymous until the cab knows which position it is. A trailer that is dropped and hooked to a different tractor still has tires that need names. The practical fleet question is how positions stay meaningful when trailers rotate. The film’s answer on screen is a monitor marked for four trailer positions and a display that stores the date and time of a low-pressure, high-pressure, or temperature problem. Your operation still has to decide how drivers confirm the trailer they hooked is the trailer on the display.
Safety at those four positions is the same physics as the truck. Duals need pressure equalized between the two tires so one tire does not carry the load and run hotter. The wireless transmitter monitors low and high pressure while it does that. Singles, where the trailer uses them, still need pressure maintained. A combination drives balanced when the trailer axles are not fighting the tractor. A perfect steer tire cannot cancel a trailer dual that is split.
Security is the driver seeing trailer position 3, or whichever mark applies, from the cab. The repeater the film places is inside the steering-axle wheel of the truck, so the tractor install is part of hearing the trailer. Antennas and the power lead are in the kit for that path. Mount the receiver where the driver can see it. Mute and power are there so a trailer alert is handled, not ignored because the device was annoying.
Value is four positions fitted in a trailer install the film calls very similar to the truck. About five minutes a sensor is the building block. About forty minutes is the truck figure, not a reason to skip the trailer because the tractor already took a bay. Sensor bars use existing hub bolts. Curved and straight fittings meet the two stems of a dual. A chrome cover is optional. The site’s all-in-one and USA lines are site claims. 104 PSI and 53°F are one frame.
Every trailer needs positions 1 through 4 in the conversation for safety, security, and value, just as every truck needs its six. When you inquire, count trailers separately from tractors. Someone replies about your trucks. If the form fails, email customersupport@truckstpms.com. The words you typed stay in the form.
Number the trailer the same way every terminal. Paint or tag is unnecessary if the handheld's 1 through 4 is the only language you use, but then everyone must share it. Left front trailer axle as one number, right as the next, and so on, written on a card in the cab until the habit holds. A driver who calls a wheel "the back one" during a night stop cannot be matched to a stored event. Practice the four positions in the yard once, with the trailer hooked, and point at each wheel as the cab highlights it. That rehearsal is the Learn step made visible. Dropped trailers should be learned again when they are hooked to a tractor that has never seen them, if that is how your receivers work in practice. Do not assume a number follows the trailer onto a strange truck without a check. Four positions is a small map. It only fails when two people are using two maps.
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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.