A journalist friend of mine was moving to Mexico and had a lot of stuff, including a desktop computer. The customs inspector wanted to do his job, but he was a practical man. Be honest and friendly and things will work out. Be arrogant and you will have trouble. When to cross Allow at least 30 minutes for customs clearing.
Weekends are the worst time, especially holidays.
If you got a late start, please spend the night in a border town. Driving in Mexico is not as dangerous as you have been led to believe, but it is more challenging. The two-lane roads vary in width and conditions so that some of them are usually in great shape, and others are often full of potholes. You will have to learn a few rules of the road For current gas and diesel prices, jump to gas prices. For road conditions, go to road updates.