Not dismissing city staff that are qualified to operate. I don’t know what the current maintenance vehicle fleet for the city of Ottawa looks like in terms of numbers. I’m guessing the numbers were not nearly enough do deal with something this big,So I saw a news clip that had four OC Transpo wreckers (white/red/yellow) and one black wrecker (assuming this is a contracted rig), so it’s reasonable to assume that Ottawa has a number of wrecker operators and if the city had chosen to not use its own assets in the end with minor augmentation from outside, then it would seem reasonable to expect those city employees to operate any commandeered equipment. Your point about needing to be trained to operate them is valid, but I don’t think on the other hand you can dismiss trained city staff.
As for commandeering vehicles, does the CC allow for an LEO who has commandeered a vehicle to then direct a civilian to operate it under that condition?