Make sure that the terrain is similar to the one you’ll be taking for your actual trip- this is so that you can get used to ascending on hills, switching lanes, and parking.
Your RV needs to have a well-stocked Toolbox, and add in spare parts that the RV may need. This includes jumper cables, extra fuses, bolts, nuts, light bulbs, and connectors.
Tires make a huge difference in the overall safety of your vehicle. Especially during winter road trips. Plus, good tires make for a much smoother ride.