Hi there Richard. Hi there! My name is***** am a computer professional with over 15 years of experience with both Mac and Windows computers, phones, tablets, and printers. I am also the proud owner of an rv. It would be my pleasure to assist you with this. While, I don't have the exit Garmin that you have, I do have an APP that is supposed to calculate the best route for RVs and motorhomes. I suspect they work in a similar fashion. As Rv'ers we have special needs. We need to be steered away for low hanging underpasses and we need to take flat routes over very steep routes, etc. Sometimes I question the routes that the APP gives us, but if I take the route prescribed by google, I usually end up with a very clear idea of why the App didn't recommend that route. Having said that, let me check to see if there are any updates available for this device. Please give me a moment to research.
There is an update available here - http://www8.garmin.com/support/download_details.jsp?id=5883. This update was made available on February 16, 2016 The easiest way to install this update is to use the Garmin Express utility.
I have attached a copy of the user manual in pdf format just in case you need it.
Please let me know how this works for you. If you need clarification on any of the steps or have additional questions I am happy to assist. I am committed to working with you until the problem is fully resolved.
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I apologize. I neglected to attach the manual. I've attached it here. Pleas elet me know if your device also has the backup camera. if so, I'll attach the manual for that model.