We don't drive our packages across the border, though we are only a half-hour away (not counting bridge delays)...
We are always asked, when we visit Canada, if we are bringing any goods into the country. Betcha we would open a can of worms if we said yes!
Seriously, it probably would not be worth the time and money (gas and bridge fees) to carry the packages across and ship them from the Canadian side. We would have to charge for the time spent doing that, and I don't think that our customers would come out ahead if we did that. Plus I don't need anything else added to my "to-do" list right now! :wink: