Tire Minder is great. They are located in Florida. I am a 65 year old female and installed them on my travel trailer. My mechanical and technical knowledge is limited. The customer service department at Tire Minder stayed on the phone with me while I installed the monitors. I had them installed in 5 minutes.
If you call Tire Minder, they will tell you which model is recommended for you travel trailer,RV or other vehicle. I love the monitors and the display is easy to see. I wouldn't travel without these on my travel trailer.