I really want to just go put something under the wheels but I’ve never talked to these people.
Update edit: thank you for all the replies. I went over and knocked but no answer. It’s definitely not chocked. If I see them come home I’ll go back over. I’m worried as soon as the weight shifts loading it that it will just go down the hill.
If I saw them I’d say something. But I wouldn’t go out of my way. You have to learn the hard way sometimes. But I would definitely point my security camera over just incase.