No problem, or reason to take it personally, but just one question.
What’s the difference between speaking to a CBP officer in person or talking on the phone?
Personally, I’d much rather speak to someone at the border crossing I will be using than someone at an airport 1,500 miles away, especially considering how few vehicles are likely be exported through the Tucson International Airport.
BTW, when I first did this, I too asked a CBP officer while I was in secondary anyways. His answer was “Just go to the CBP website, everything you need to know is there.”. Sure enough he was correct.