A blowout on a loaded RV or a fifth-wheel trailer rarely arrives without warning. Pressure drops slowly — a small leak, a temperature spike on a long climb, a valve that has been weeping for weeks. By the time the tire lets go, the cost is measured in bodywork, towing fees and a ruined trip.
The problem is that most tire pressure monitoring systems assume you own one vehicle. If you tow more than one trailer, or run a rig with more than eight wheels, the standard kit runs out of answers.
That gap is what the GRUNDIG 860 TPMS is built for.
Why most TPMS kits fall short
The majority of RV tire pressure kits cover four to eight wheels on a single trailer. That works fine if your setup never changes. But plenty of owners rotate between a travel trailer on weekends, a utility or boat trailer during the week, and a dually pickup in between.
With a conventional system, changing trailers means re-pairing sensors, or clearing the old configuration and starting again. In practice, most people stop bothering — and the sensors sit idle on whichever trailer isn't moving.
Multi-trailer switching without the re-pairing
The 860 stores several trailer profiles in onboard memory. Sensors stay paired to their own trailer permanently. When you switch rigs, you select the active trailer on the touchscreen and the system monitors only that one.
The trailer parked at home drops off the display completely. No false alarms from tires that aren't rolling, no re-pairing, no resetting the whole system every time you hitch up something different.
It is a small feature on paper. In daily use it is the difference between a TPMS you keep switched on and one you quietly stop using.
From 6 wheels to 110
The same system scales from a 6-sensor RV kit up to 110 wheels using multiple signal repeaters. One product therefore covers a weekend RVer and a commercial fleet operator, which also means you can start small and expand as your setup grows — additional sensors can be added later without replacing the monitor.
Monitoring range runs from 0 to 200 PSI (13.8 BAR), high enough for heavy-duty trailer applications rather than just passenger-car pressures.
What the 5-inch touchscreen gives you
All settings and readings are handled on a 5.0-inch colour touchscreen LCD, designed to stay legible in direct sunlight. Pressure units can be toggled between PSI, bar, kPa and kgf/cm², and temperature between °F and °C.
Under the hood, the 860 carries 4GB of eMMC flash storage plus 128MB of DDR3 SDRAM. That is what makes the multi-trailer memory practical: sensor ID pairings, trailer layouts and pressure history logs survive a power-off, so nothing has to be reconfigured when you start the vehicle again.
At the sensor end, the system uses a German Infineon microchip on a dedicated 433.92 MHz frequency — chosen for anti-interference performance over long trailer lengths, where signal reliability is the usual weak point. Rated accuracy is ±1.5 PSI and ±3°C.
Six alerts that actually matter
The display and audible alarm cover six conditions:
- High pressure — triggers before a heat-driven blowout develops
- Low pressure — protects rims and preserves fuel economy
- High temperature — catches tread separation risk early
- Fast air leakage — detects a puncture within seconds, giving you time to pull over
- Sensor low battery — shows the specific wheel position
- Sensor fault — flags signal loss, damage or communication failure
External sensors are rated IP67 and run on user-replaceable CR1632 coin cells, with roughly two years of typical service life. Replacing one takes about a minute with the included tool.
Who it is built for
- Class A, B and C motorhomes — including large diesel pushers
- Fifth-wheel and travel trailers — toy haulers, horse trailers, boat trailers, multi-axle campers
- Dually pickup trucks — Ford Super Duty, RAM 3500, Silverado HD and similar tow vehicles
- Commercial transport — semi-trucks, dump trucks, multi-axle logistics fleets
- Multi-trailer owners — anyone swapping regularly between different trailers
Specifications
| Display | 5.0-inch colour touchscreen LCD |
| Monitoring capacity | 6 to 110 wheels |
| Trailer management | Multi-trailer memory and switching, no re-pairing |
| Memory | 4GB eMMC flash + 128MB DDR3 SDRAM |
| Pressure range | 0–200 PSI (0–13.8 BAR) |
| Accuracy | ±1.5 PSI, ±3°C |
| Operating voltage | DC 9V–36V (12V and 24V systems) |
| Frequency | 433.92 MHz, German Infineon chip |
| Sensors | External, IP67 waterproof, CR1632 user-replaceable (~2 years) |
| GPS edition | Optional — compass, speed, altitude, trip distance |
| Operating temperature | 32°F to 122°F (0°C to 50°C) |
Frequently asked questions
Can I add more sensors later?
Yes. The system supports 6 to 110 wheels, so you can start with a base kit and add external sensors as your fleet or trailer setup expands.
What is the difference between the standard and GPS versions?
Both monitor 6 to 110 wheels up to 200 PSI with the same touchscreen controls. The GPS edition adds an internal GPS module showing compass heading, real-time speed, altitude and trip distance.
How long do the sensor batteries last?
Each external sensor uses a CR1632 coin cell with roughly two years of average service life. They can be replaced in about a minute using the included tool.
Does it work on 24V vehicles?
The monitor accepts DC 9V to 36V, so it works on standard 12V cigarette lighter sockets as well as heavy-duty 24V commercial vehicle systems.
Where should the signal repeater be mounted?
For trailer setups longer than 10 metres (33 ft) or configurations of 22 to 110 wheels, mount the repeater near the midpoint of the trailer. Red wire to positive, black to negative.
Installation notes worth knowing
Two things trip people up with external sensors. First, always power on the monitor before fitting the sensors — install them with the display off and the system can take up to ten minutes to sync. Second, check that your valve stems are metal, brass or aluminium alloy rather than rubber; external sensors add weight at speed, and rubber stems flex.
After tightening each sensor, spray soapy water around the valve to confirm a clean seal, and thread the anti-theft hex nut on before the sensor itself.
See current kit options and pricing for the GRUNDIG 860 TPMS →