While I still have no response from the local police, I did contact Alberta Infrastructure and Transportation
, and spoke with the person responsible for non-commercial vehicle inspections. He confirmed that the only applicable regulation is the one which I quoted earlier, and that there is no specific requirement for ST tires
, or prohibition against any other type.
He emphasized the need for adequate load and speed capability, and use of tires
federally approved for highway service, but of course that would include any tire (trailer, truck, passenger car, or otherwise) which we would consider for use on our trailers.
I am confident that there is no Alberta requirement for ST tires
, and I would be interested in seeing an actual regulatory reference for such a requirement existing anywhere in Canada. Since the police officer who told Laura that there was an ST requirement in Alberta did not quote any regulation, I suspect that he was just taking a conservative guess - but thanks, Laura, for letting us know what you found.
I may, in the end, put ST tires on my B1700, but I'm not concerned about legal compliance with any properly chosen tire. Of course, it is each person's responsibility to ensure that they are in compliance, regardless of what they might hear from anyone else (like me).