Oh, I agree. But you haven't given me any basic premise, in the trailer. Here's what I got, from the trailer:
Dudes take a road-trip (for some reason that I don't know).
Dudes do the typical young-adult thing, and question what it is that they're supposed to do in life.
Something mysterious is in their car (but that feels like an afterthought).
Other than the part about something mysterious in the car (the shot in which the dude says, "you should take a look at this"), everything I learned about this movie, by watching the trailer, is that it's a dramatic Road Trip movie.
That's really just the genre. High school graduates taking a road trip doesn't really count as a plot, because that is such a recognizable, well-established genre. For the most part, all you've given us, in this trailer, is the genre.
I'm asking for a little bit of the plot. You don't have to give everything away. But give us something. Or, in your words, give me the "basic premise". I'm not trying to shoot you down, bro. I'm just being honest -- as is, the trailer doesn't give the basic premise.