David, the Garmin Nuvi series can be set for Truck or Bus. I have a Nuvi 650 that works reasonably well. I primarily use it in the car however. In the Newell, where I have more room and like a larger screen, I use a laptop running Street Atlas with their USB gps unit. Street Atlas allows much more flexibility in choosing your route in advance but does not specifically route you around low clearances. For that, a laptop running Co-Pilot would be preferred.
There is no perfect system out there. They all have advantages and disadvantages.
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