Hi Gary and welcome.
I bought a Rand McNally RV GPS at Camping World. You can plan your trips on your computer and then download them to the GPS...a lot easier than doing it all on the GPS. You can also put in the width of you rig, length including toad and height. This will keep you off narrow roads and low bridges.
The unit can also spot rest areas and Flying J truck stops. I have found it very useful.
I also use ALLSTAYS Walmart for overnight parking...an app on my phone. It is great for locating the Walmarts in your current area (GPS enabled) with user comments and phone numbers.
I have the Good Sam Road Side Service. Never had to use it but I travel with less stress.
Hope you enjoy your travels as much as I have.