I believe no border crossing will prevent you from bringing in a vehicle.
There are designated crossings that deal specifically with importation, and as I recall, these are the ones you want to avoid.
Port huron is not one, and I breezed through with my bike, painlessly, in 15 mins.
I was told (a few times) by a fellow racer, who has imported many cars, that he specifically avoids the designated border crossings in order to simplify importation.
That may change now.
With all the people bringing in bikes, and cars, the un-designated crossings may be getting better educated.