After contact with the seller, I was able to finally buy a repeater from them which fixed my interference problem. Last trip, the monitor performed beautifully. Glad to see that they ONLY sell their system with repeaters included. I wired mine to be connected to the front clearance light on our trailer. We always tow with the lights on so there is no need to connect and disconnect or worry about battery drain while in storage.

This monitor used to work great, but now it is totally frozen. Our last trip of over 3 hours driving, the pressures and temperatures of all 4 trailer tires never changed a single degree or psi. The monitor is completely locked up. Even now, when our trailer is 20 miles away in storage, the monitor is still indicating the same values as it did a week ago. Wrote bellacorp an e mail, and they suggested that our backup camera is interfering with the TPMS. I see that now they are including the repeater with the purchase of their system. I don't know if I will give them another $50 for a repeater or just junk this one and buy from one of their competitors. Don't rely on this TPMS keeping you informed or safe. NOT RELIABLE

Right up front: I like this system and am very happy with my purchase.

As an automotive executive, I am very familiar with the value of a TPMS system. I wanted to add a system to my camper to improve towing safety. I researched many reviews finding that the Bellacorp system was consistently mentioned as one of the best systems. While I suspect many of the systems would perform adequately, what sold me originally was the fact that the company has included a repeater (previously a $50 option) due to their concern that the frequency utilized is getting crowded and they want to ensure solid performance - this told me a lot about the company. The repeater was simple to install if you have even basic skills.

There are fancier systems, and systems that have more elaborate screens, etc., but I was looking for simplicity and solid performance. The instruction manual is clearly written with significant detail providing excellent documentation of all of the features and options. The setup was simple, fast, and easy. You screw on the sensors, mount the monitor, and you are in business. You can alter all sensor alarm settings to be as sensitive as you wish following the well documented manual.

I tested the accuracy of the pressure sensors with a NIST-traceable pressure sensor and all sensors were spot on, and well within their tolerances. I didn't test the temperature sensors, but all of the sensors accurately measured the ambient temperature of cold tires, and tracked consistently during towing. I checked the alarm sensitivity by removing each sensor, and was rewarded with a nearly instantaneous alarm.

If you are looking for a simple, accurate system with excellent performance at a reasonable cost - look no further. The Bellacorp system met every one of my expectations, and as they are concerned enough with meeting performance expectations to throw in free options, I can see why they are consistently considered one of the top systems around.

I recently replaced the tires on my tandem axle Airstream travel trailer. The tire shop replaced valve stems along with the tires. Unrelated to the tire change, I added the Bellacorp TPMS before taking a planned 3,000 mile trip. Two days before we left I took a shakedown cruise. It was the first time the tires rolled. Within 5 miles I had a TPMS low pressure warning. Long story short... all four valve stems were leaking. The shop replaced them (I now recommend full steel stems!). The trip went as planned. I'd say the TPMS saved me from being stranded on I-95 in August Florida heat... or worse. During the first part of the trip I experienced intermittent loss of signal from the sensors. Bellacorp tech support was great. I added a repeater at Paul's suggestion. Many Airstream owners determine repeaters are needed regardless of which TPMS system they use, so I didn't see that as a Bellacorp issue. 2,000+ miles later, I'm a happy camper! One more benefit... I've always felt my Airstream dealer may have set up the hitch system with the trailer a tad low in the nose. The TPMS showed both front tires heating up 3-5 degrees hotter than the tires behind them. That's just enough to have me revisit the hitch setup and probably raise the ball an inch or two. That's was an unexpected benefit of closely watching tire performance. Every component of the system has worked without any issues. The system is priced right. Tech support is excellent. I don't give many 5 star ratings, but for this system I'm happy to do so. My local Michelin dealer? Not so much...

At first I had problems until Paul, the Bellacorp customer service rep, asked me a few questions .. including "did I have a weather station in my trailer?".. yes I do... turns out that the outside sensor for most clock or weather stations that show the outside temp use 433mhz frequency for their sensors which is close enough to the frequency that the TPMS sensor also uses so as to cause interference. BUT by using the repeater that BELLACORP sells for their TPMS, the system works great and starts updating tire temp and pressures after about 800' from the start of your trip (they 'sleep" while sitting still to save battery life; motion wakes them up and they start transmitting current data)
I highly recommend BELLACORP because of the customer service I received from Paul, AND recommend that, for best reliability, that you purchase the repeater with the system up front so you don't run into interference like I did at first. Its only about 35 feet from the rear tires of the trailer to the dash of my truck but there is enough metal to overcome in the direct line of sight that without the repeater, the system can be rendered unreliable if ANYTHING is transmitting in the 433mhz range. With the repeater, it boosts the signal enough to overcome all the metal and frequency interference resulting in a reliable tire status AND an alert IF any of the temp or pressure setting you choose to set in the system so you can get stopped BEFORE a failing tire causes hundreds of dollars of damage to your trailer. Even if you don't have any 433mhz interference from other sources, the repeater boosts the signal to get a strong signal past the metal barriers between your tires and the dash of your truck where you want the information, more reliably.

So far I am very satisfied with the Bellacorp TPMS.
I have had this TPMS for about a year with several thousand miles on the sensors and device.
I ordered the 4 sensor plus repeater for my two axle 5th wheel toy hauler. I have had other TPMS units which all seemed to have issues that cost me money i.e. non-replaceable batteries, no temperature readings, etc. This TPMS is a great COMPLEMENT to good tire maintenance. I physically inspect my trailer tires frequently and will "wake up" my sensors (loosen then tighten) to get the latest pressure readings very quick and easy while refueling. That process will also alert you to battery or sensor problems. One of my other TPMS units would constantly set off tire alarms as batteries would lose power, repeatedly connecting and disconnecting, requiring immediate action to replace batteries or turn the unit off completely until it could be addressed. So far, I prefer the way this unit responds. TPMS should aid with tire maintenance not be used to replace the physical inspection. I also remove and replace the sensors when the trailer is parked for long periods without use.