Prius towing a travel trailer? Yes.

I think you need to look again, the car beside the prius is a white sedan who's back bumper is too far back to be towing it, then in the little black suv. If it's like every other costco gas station I've ever seen he's turning into the pumps that would explain the angle. The tongue jack doesn't appear that close, my trailer would be less than 12" from ball to jack. It also seems a little unlikely that someone would say they saw it without actually seeing it.