Why container ships are awkward naval auxiliaries

How practical would it be for Canada to operate several container ships?

Not very practical: container ships can add complications and stress without necessarily easing naval operations.

Operating commercial container ships would not automatically make Canadian naval tasks easier. Acquiring four hulls would create a fleet on paper, but it would also add the burdens of operating ships poorly matched to naval work. No conversion package is offered to cure those drawbacks. Available commercial tonnage should not be equated with an immediately useful naval auxiliary capability.