There's a new option for navigation using your Android smartphone and it looks pretty good for a brand new app. It's called NavMeTo Truck Navigation. RVers can use it by selecting the box truck profile and use the flammable liquid hazard option.
This app uses offline HERE apps (updated quarterly) and HERE traffic, same as Garmin. You can view truck restriction icons on the map which is a nice touch.
The routes I've used to test are pretty good.
Download here: https://play.google.com/store/apps/details?id=io.noox.nxfleetmobile.play.truck
2011 Born Free 22' Class C Rear Side Kitchen