Some interesting info. Thanks all.
I'll ad OBD Fusion. It monitors a whole bunch of info on your car/van/etc. It also reads trouble codes. It uses a bluetooth transmitter plugged into the OBD port.
I use it mostly in the Roadtrek to monitor transmission temperature. I'll be using it especially when pulling a trailer in the mountains.
I also have All Stays. Lots of good info when traveling for camping(including free spots), motels, repair shops, propane and more. Geared for an RV traveler. Quite handy when traveling with the Roadtrek.