If you own a Rand McNally Motor Carriers' Road Atlas, use it to identify truck routes in the area. If you do not own one, buy one. They are on sale cheap at truck stops now as next year's version is not far off.
If you specify your pickup and delivery locations (or close so you do not reveal your customer info), there are a whole bunch of people here on EO that can use CoPilot Truck to specify a route for you.
If this is for a run, would not your carrier provide the info?