A lot of people have put tire monitoring systems on their trailers and tow vehicles, as well. Just about all of them swear by them, regardless of the brand. Some, like the newer model of the TST have batteries that the user can replace. Others have 5-year batteries that need to be sent back to be replaced. My TST set is the latter. For now, I only have sensors on the trailer's four road tires. My truck currently has rubber stems and won't have steel ones (metal stems are required) until I get new tires some time in the future or get even more fed up than I did recently while trying to check the pressure on the inner duallies.
A word of caution on tire monitoring, though. Don't get mesmerized by the numbers changing as you drive. The tires heat up and the pressures rise. One side will run higher and hotter than the other due sun load and the weight distribution of the trailer. Once you get used to it and it stabilizes, the numbers will be the norm for you, not necessarily the set points in the instruction manual. What you're most concerned with is pressure decreasing in only one tire as you drive. That tells you something is wrong. But if it's a true blow-out, the warning may come a moment after you see pieces of rubber flying from your rig.