As Lakeside mentioned, just give them what they ask for and nothing more. Keep your answers as concise and honest as possible but don't elaborate unless they ask additional questions. Driver's license, vehicle registration and vehicle insurance are state and provincial matters in both our countries. The federal border agents have little or no interest in them. Once they scan your passport into their computer system, they will more than likely have a copy of your driver's license and a ton more stuff, things you hope your spouse never sees or hears about. LOL
The two countries share computer information with each other. Now that both sides are using "face recognition" cameras and software, after the first crossing the other tend to go quicker. Also the border officers of both countries are allowed to profile. Depending on where you reside, what line of work you have been involved in, past crossing history, past law violations in either country, etc. will all have a large part to do with the questions you are asked and whether you will win the brass ring and get the personal attention of a couple of agents as they check out your rig. I got the full search on our south bound trip coming back into Canada from Alaska at Beaver Creek. Took an hour and was enjoyable to watch real pros do their jobs. Very little mess when they had finished and we were on our way.