I've had a Talon TPMS for two summers now. It's made for 18 wheelers and can handle something like 22 tires, but works well for motorhomes. In general I like this system, but it does have some issues.
I've tested the accuracy with two tire pressure guages and it's dead on. No problem there. Every now and then I will lose a signal from one or two tires. After a short period the signal has always returned.
The system I use has the pressure sensor in a large cap that screws onto the end of the valve stem. They also have sensors that mount onto the inside of the rim, more like a traditional sensor.
What I like best is the peace of mind this give me. I've heard of people blowing inside rear tires (or having very low pressure) and not knowing about it until someone told them or it was too late. It's also interesting seeing how heat effects the pressure. It's not uncommon for the tires to increase in pressure by 10+ lbs as the tires heat up. It's also great to check the pressure in the tires while in the coach before I leave the campground. I've seen statistics that very few people check their tire pressure, including RVers. This system makes it a no-brainer and a no-effort exercise.
Jay & Jane (Jazzy and Jewel, too)
2014 FR3 30DS
Twin Cities, MN