[Chester B. Stone, Jr.]

This is a tough situation. I purchased the Rand McNally for RVs and I do not recommend it. It is hard to see on a bright day since it has a light green background and white streets. Yesterday, it sent me 32 miles out of the way. Garbage. I am interested in the Garmin for trucks and the other one sold by Camping World (having a senior moment), but preliminary research tells me that they do not have a port for an external antenna, which I consider essential. I plan to do more research to find the perfect unit, but am not hopeful.