I've been pleased with my TST 507 system. Many members here also have Tire Minder, Tire Tracker, etc. In my view, as long as it works, the brand does not matter but it's very important to have the tire monitor system, especially on something being towed as you'll never know you've lost a tire until you stop.
Regarding the tire temp question, here's a quote from the TST507 install manual.
From TST507 Install Manual wrote:
we recommend you leave the temperature set at 157° Fahrenheit; tires typically fail between 180-200° Fahrenheit.
Fred