I would suggest an inexpensive volt meter, a 50amp to 30 amp dogbone, a space heater(cheaper to run than using your propane) a small fan when it's not hot enough for the AC but want some air movement, a good water regulator like a watts, an oxygenics shower head. Fuses were mentioned but make sure to get the large ones 30amp or 40amp that you will see on your converter. 10/15/and 20 amp are always easy to find the larger ones not always. We find an electric skillet is a handy thing to have. If you have a tandem axle trailer some type of x chocks will help take the movement out when you are inside. You'll find more every time you camp. You are never done buying once you get an rv. You don't need all this to start. Go out and enjoy and build your "must haves" as you go. Happy Camping!