I just want to spread awareness about the switch off procedure for Traxxas Stampede VXL Rover with pixhawk 4 :
First of all, switch off the ESC, if you start by disarming, the rover will go full speed uncontrolably.
Then switch off the servo power supply
And finally disarm the rover.
It can be a massive damage source as it can go full speed, so I think it could be important to integrate this procedure in the user guide.