Watch Happy Campers for Free: How to Stream the Movie Online at 123Movies. . When Josh, Kane, and Seth head to Mt. Charleston to enjoy a weekend among nature, they aren’t expecting to find themselves in the middle of a couple’s stormy relationship. A campsite mix-up puts the boys right in the eye of Trevor and Levi’s issues. Though Trevor thought the trip would be good for him and Levi, he has no idea just how therapeutic it will be, and that so many things can be fixed with some good-old-fashioned-Vitamin D.