I don't find trailers spoil anything for me. I love watching trailers and getting a 'sense' of the film. The majority of them don't spoil the movie... in fact the only time I can think of where I felt like a trailer did was Cabin in the Woods. I literally immediatley wished I hadn't watched that.
I just wanna avoid major story details.
But TBH... I doubt i'll succeed.
It's like any addiction. You think 'oh readind this ONE spoiler won't do too much damage'... and then again... and again... and it all adds up