Driving on the highway will be just like driving a car. Just keep your distance from the vehicle ahead as it takes a bit longer to stop. What you might want to do is practice tight turns and backing up. Find a big empty parking lot and with a 2nd person practice following the directions of that person to guide you backing into a space. You can drive around the lot and get a feel for what it takes to make turns and how to make a right hand turn without driving over the curb.
There are RV driving classes available as well if that is more to your liking.