I'm with Jamie on this, the screen is too far from the line of sight down the road. The screen is too small and not aimed properly for this function.
I also use the Garmin 760RV, and set it for each leg of the trip. In planning, I use an older software, MS Streets & Trips to map out the orchestrated parts of our trips. Google Maps or the Good Sam trip planner are easier to access. The Garmin will let me know if the road won't be good for our rig's height and width.
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