We have the Garmin truck GPS. Remember truck GPS are built to ensure trucks (not motorhomes etc.) can navigate turns easily and safely and to not use streets/roads that would not be appropriate for OTR trucks. Therefore, they will not always use the most obvious or direct route. Add the Low Clearance POI database and you will not usually find yourself in a bad situation. However, GPS units like all computers are only as good as the software operating the unit and the map database. Keeping your database current is also critical. We have a second Garmin non truck GPS in our toad.