Street Pilot 580, you can fnd them new on ebay from 300+, but if you search amazon they have them for 149.00. They are discontinued, but you can upgrade the maps, I just did mine for $65.00, I also loaded up POI's. I have taken it to Iowa, through Canada and back and the truck routing hasn't steered me wrong yet. It even fighst me getting on the GSP in NJ since trucks are banned from exit 105 up. It's a great unit, has MSN updates if you so choose and also blue tooth compatible and mp3 player.
We like it and it has been great
Good Sam Haulin Highlanders