We will be staying in Shelby, Mt before we cross into Canada, and were planning to cross at Sweetgrass. Looking at Google Earth, it looks like a really large and busy facility. Del Bonita crossing i...
Sweetgrass is larger but will have more agents working. The road there is also divided.
Del Bonita is quite a bit smaller but the road getting there isn't very good.
Babb is a bit bigger than Del Bonita and has better roads.
At the smaller crossings you have a bigger chance of being held up if there are only one or two agents and they are doing a full-scale search of a person or vehicle.