David, was there any search of the vehicle or just questions?
In our case it was just a few questions. But cars ahead of us seemed to be more thoroughly checked. It was taking about 5-10 minutes per car before we got to the checkpoint, but only a minute for us. I don't think they were looking into trunks in most cases.
The one question I always love at border crossings is this one: "Do you have any drugs or alcohol in your vehicle?"
I always have an intense urge to reply with, "Yes, I have 40 kilos of crack in the trunk. That's okay, right?"
I mean, what do they expect you to say?
A better option would be to get all offended by the question and say something along the lines of: "Of course not, what do you take me for. The only things I have in my trunk are the dead bodies of women I picked up hitchhiking on my way here. How dare you ask me that?"