FWIW, in the partial photo of the truck, it really looks like either hoses or perhaps a lawn mower handle sticking up...so either a landscaper who mows lawns, or a pool cleaner or carpet cleaner with hoses?
I enlarged the picture to 500X, and it to me it looks like someone is holding someone else down in the back of the truck...the person being held down is using an arm to push away the other person. Could be way off base, but it looks like it to me. If you see the other photo of the truck, you can see someone sitting in the passengers seat.