In the past, when my coach had no generator, I used LP while driving in areas in the South. Although I have a generator in my present rig, since we drive a great deal on our vacations, using the generator would require oil change 3/4 times during a trip. I therefore installed an inverter with a 10 amp rated 3-way switch (closed-open-closed), so that I could use either my inverter (600w) or the normal motorhome 110V circuit to power the reefer. I could also turn off electricity completely if necessary. I have used this setup for two years with no problem.. I was a bit concerned about the sawtooth wavefrom from the inverter (new ones can provide a true sine-wave form, but they are pricey), but found no problems stemming from that source.