This black work truck carries sensors to detect, and gear to respond to, nuclear, biological or chemical (NBC) weapons attacks that threaten the Motorcade. It also works as a roving storage vehicle, carrying supplies and other classified capabilities.
Bidens entourage yesterday during the "F you" video has an ambulance
Sauce https://ussanews.com/2022/07/21/lets-go-brandon-protesters-in-somerset-give-joe-bidens-motorcade-the-middle-finger-video/
Hazard Materials Mitigation Unit
This black work truck carries sensors to detect, and gear to respond to, nuclear, biological or chemical (NBC) weapons attacks that threaten the Motorcade. It also works as a roving storage vehicle, carrying supplies and other classified capabilities.