There are many good GPS units on the market today. I have the Garmin RV 770 LMT-S GPS. You set it up with the length and height of your RV, select the types of roads your prefer...toll/no toll, tunnels, etc. and it does the rest. It is also voice controlled so very easy to use while traveling.
As far as actually driving the RV, with your past experience you should have no problems. Just remember the wheel cut with a gas RV is around 35 degrees versus 55 degrees with a diesel pusher. This simply means you can't turn as sharp as you might be used to. Plan ahead and use your mirrors and you'll be fine.
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