A:AnswerThe notable difference between the nüvi 55LM and the nüvi 67LM is screen size. The nüvi 55LM has a 5 inch display and the nüvi 67 has a 6 inch display. The nüvi 67adds the Real Directions feature, Foursquare, and is compatible with the backup camera. To get more information about real directions please click http://support.garmin.com/support/searchSupport/simpleCase.htm?caseId={3ef853b0-9aeb-11e2-65d0-000000000000}&kbName=garmin.
For more about Foursquare click on http://support.garmin.com/support/searchSupport/simpleCase.htm?caseId={aa04d3e0-4e54-11e4-ef05-000000000000}&kbName=garmin.
~JH
A:AnswerNo, truck routing cannot be downloaded to this device. I recommend looking into Garmin's dezl series of devices, which are designed for commercial vehicle use.
-MH
