OBD Fusion w/Veepeak OBD2 BLE

Looking for a little help. I have a 2013 Tacoma Prerunner TRD Sport w/tow package and 90K miles. I periodically tow a camping trailer with a dry weight of 3890 lbs. I've read a ton of the forums here on towing and monitoring trans temp but needed some specific answers. Just did a complete flush and fill on my trans yesterday.
I bought the enhanced PIDs on OBD Fusion to monitor my trans temp but it has options for Trans temp 1, trans temp 2, and trans temp 3. What is the difference between the three trans readings? What is the difference between the engine temp reading and the engine oil temp reading?
What PIDs should I be monitoring not only while I'm towing but just to keep tabs on the general health of my truck? Thanks for any input.

 

Late to the party here. I think #1 is the trans. #2 is the torque converter. #3?