It seems you got the PC thing down. Did you use AIO on that red truck?
It maybe a new clearcoat over swirls/scratches. This guy may have taken it to a bad shop to shine it up, instead of wet sanding, polishing, they prob just sprayed a clearcoat on for 100 bucks. Ask Him or her.
Try a small section (16"x16") moving the PC as if an "ant" were walking on your car. Apply enough pressure making the pad look a little pressed, but to where the PC is not bogging.
I am not going to give rotary advice because I am just starting out.