TireMinder has a smartphone TPMS system now available at our wonderful CampingWorld stores (tongue in cheek). Looks to be a lot easier to use than previous TireMinder systems. Works with Apple Iphones, Ipads and Android devices.

TireMinder Smart TPMS with 6 Transmitters for RVs, MotorHomes, 5th Wheels, Motor Coaches and Trailers - TireMinder TPMS-APP-4 - Tire Accessories - Camping World

TireMinder Smart TPMS - Smartphone Based TPMS for RVs, MotorHomes, 5th Wheels, Motor Coaches and Trailers - Minder Research