Your sources indicate that the majority of the funding is from Canada. The second largest source is from the US (which doesn't seem out of place, given that cross-border trucking restrictions affect both American and Canadian truckers):

> A review of the data shows that some $4.3 million came from Canada, while another $3.6 million originated in the United States, though the United States accounted for the most individual donations. Small donations from dozens of other countries made up a fraction of the total amount raised.

> and that most canadian donations are from wealthy business owners, not workers

This is true for most causes. Workers don't have much money to donate, and rely on wealthier people sympathetic to their cause.