Mapping programs and Garmin RV770

I had a Gamin C330, it was one of the Garmin's first with commercial programing. Was it perfect? for the most part passable. I was a training engineer for one of the major truck lines and trained drivers to use it and their 'Drivers Atlas' together to verify clearances and restricted routes. My favorite thing was to have the Garmin programed to take the shortest route to one of our local consignees. I knew that within five miles of our destination that the garmin would try to take us into a street that had a five ton weight limit. I have seen several drivers set up for the turn and stop because common sense told them that a 80,000 pound vehicle should not be on that residential street. This was a useful tool. You need to have good software in your GPS and with that being said, back up your route with the knowledge of what your driving/hauling with a 'commercial driving atlas' that has all of the restrictions and height restrictions for your next adventure.