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Certainly the computer route is the best option as far as screen size goes and upgrading software. The problems you run into with all of them is they need to have their database updated on a fairly regular basis, especially if you like the POI functions.
The problem with using a computer based model is they are much harder to lug around and there's not as many mounting options. Although in a truck this may not be as much of an issue as you can probably secure it more easily than in a car and if you're overnighting in the cab anyway, there's no need to move it every time you shut off the vehicle, and you're probably lugging around your laptop anyway.
As far as standalone models go, my best experience has been with the Garmin products, although most of that experience is with their aviation products. They do bend you over on software upgrades, but I suspect this is the case with just about all of them.
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