"I refuse to answer that."
"I don't consent to any search (beside that of the freight and the operation of the truck and commercial documents)."
Uh-oh, greg334 is going to have something to say about that, something about it bring your legal, moral, and ethical duty to volunteer for a roadside cavity search if the officer wants to conduct one.
And above all else, KEEP YOUR MOUTH SHUT! Everything you say MAY be used against you.
I have an info graphic with overlapping circles showing who goes to jail. The biggest circle is titled "Those that talk to the cops." The small circle is "Those that don't talk to the cops." There's a small area where the circles overlap.
I didn't explain that well, but it shows that of all the people arrested, the vast majority are ones who chose to answer questions beyond name, address, DOB. Don't talk to the cops, and you're most often depriving them of the information they need to make an arrest. I saw a video produced by the ACLU that said even wishing an officer a good day opens you up to further questioning when you wouldn't be open to it otherwise.
I was watching Cops one day, and a guy gets pulled over for suspicion of driving a stolen car. He didn't steal it (strictly speaking) but had borrowed it from the guy that did so he could go pick up some chicken for dinner. No sooner does he pick it up than John Law is behind him. During questioning on the roadside, the cop is unable to get him to confess that he knew the car he was in was stolen, our that he knew it was stolen when he borrowed it.
So the cop is anxious to get him off the road and into an interrogation room where the odds would be more in the state's favor. The guy protested that he just wanted to get home to eat his chicken, but the cop leaned on him a bit and he eventually went.
So the cop starts in on him in interrogation, while the guy's hungry and just wanting his chicken. Soon, though, the guy admitted that he knew the car was stolen when he borrowed it, so the cop came back out and told the camera that the guy admitted it. The cop says, "I told him that after the interview, he could have his chicken, so I gave it to him." The camera showed him in there, eating it. Afterwards, he was cuffed, and taken to booking for pictures and prints and put in a cell, and charged with possession of stolen property or some such.
Now, that guy was guilty, and thieves should face the consequences, so I'm not crying any tears for him. But as I'm watching this, I'm thinking, the guy was stupid to go with the cop to the station when he wasn't under arrest, prolonging his questioning, giving the cop more opportunity to get the piece or two of information he lacked to make the arrest, and also going to a place that gives the cop home field advantage,.so to speak.
A cop's job is to lock your @$$ up. Even answering your truck's door when you don't want to is helping them.