Garmin Nuvi 770 lacks RV (truck) routing

 

I compared the TomTom 920 with the Nuvi 770 and chose the Garmin based on good experience with a prior Garmin model. However, I found that the Nuvi 770, unlike the 600 series Nuvis, does not offer truck routing. This is a pain when driving an RV and having to avoid parkways, etc.