I remember watching a trailer for a low budget independent horror movie. I can’t really recall what it was about but I seem to remember the main characters are in the countryside and come across some other hikers/campers. I think the other hikers end up vanishing/go missing and it I think it’s implied there is something supernatural going. I recall a moment where a tent shakes or appears to move suddenly forward at the screen.  It’s not any of the Blair witch movies or a field in England.