The scale just past Perth on Hwy 7 is always on and can be used when not in active use (I have rarely seen it manned). But from Kanata, I would probably head up to Arnprior and use the CAT Scale at the Antrim Truck Stop. Probably a shorter drive than Perth, and gas is awfully expensive now. I tend to hit either of those two (or the Prescott CAT going south) depending on which way our travels take us.
