I use the Garmin RV 770 as well. Recently completed an 800 mile trip to Middlebury, IN that included Interstates, US Highways and State Routes with no issues at all. In fact I had more problems with my TPMS system in the mountains than I did with the GPS. We are going back to pick up the coach and will bring it back home next week using a different route. The different route is not because of. the GPS but rather because we want to stop and visit our youngest grand daughter on our way back home.
The Rand McNally RV GPS I had before the Garmin sucked. It constantly tried taking on routes where I knew I was over weight for a bridge or down narrow alleyways. It did not want to allow me to go down a road to a campground when there was a weight restriction 25 miles after my turn off. I sold that GPS unit to an independent trucker that was happy to get one cheap.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk TOAD
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