There are so many different types out there that you need to decide what works best for you.
Most tire sensors have to be removed to add air. Some allow you to add air with the tire sensor in place, which is more convenient, but more expensive.
If the sensors for your duals are placed on braided valve extenders, the temperature readings will be inaccurate.
Some systems have an extra cost amplifier that helps allow the sensors placed on your toad to be monitored. I am not sure about interference between existing built-in sensors on newer vehicles and an additional sensor screwed on to the valve stem. It may not interfere with some and may cause problems with others.
The TPMS systems that have tried are not that accurate. I use a balancing inflation system for my duals and my front tires. Even tho both tires are connected together and inflated to the exact same tire pressure at the same time, the TPMS would report pressure differences of up to 3 psi with one system and 5 psi with another system.
As the recent posting about a "blowout" indicated, since his tire never deflated, you would have gotten no warning that the tread was about to peel off on a dual. The sensor at the end of the braided inflation extension would have prevented the temperature reading from being accurate, especially during cool weather.
I stopped using them because of inaccuracies and false alarms.