I like the dark moody feel to it, and it's exposed to echo the weather, but (you could feel the but coming couldn't you!) but... it's a bit of an odd picture. The trailer is quite an interesting subject, but perhaps try getting close to it so that it fills the frame. Maybe even a crazy angle on it to spice it up a bit?
Also, a wide aperture (low f-number) will give some blurriness to the background which should help direct the viewer to the subject - at the moment, everything is sharp, so you don't know where to look.
Rob