Welcome from FL. I pull a 24 ft camper, easy pull.
There is a lot you can do with forscan and frankly for a truck nerd it is a must, but disabling the auto start is easily done by just pulling the plug at the neg terminal of the battery, disabling both auto start and battery management. This is exactly what forscan will do by software.
I went a step further and bought the autostart module, well worth it in my opinion.
2013 F150 5.0 XLT
2018 F150 3.0 Platinum Ruby Red