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Hermit, over night if hot or cold don't you burn a lot of fuel in the generator or LPG for heat at a Walmart? Probably not as much as a park fee I guess.



Previous owner had one of these installed.

http://www.fantasticvent.com/fan-tastic-vent-s-retail-12-volt-fans.html#model7350

With 2 12v house batteries, this thing will run all night. The nice thing is; you select the temperature range you want and it will speed up or down to maintain it. If it rains, it closes automatically! We find a secluded spot, crack open the windows in the bedroom and it will draw a nice cool breeze through the coach (I like to hear what's going on outside and the sound of diesels idling nearby lulls us to sleep). Those same house batteries will simultaneously power the 12v TV for about 6 hours before it drops out. Drawing less power, the fan will continue to run. On a few occasions, I have started the Generator to run the A/C at night, but rarely is it necessary.

LP powers our water heater and furnace. We also use it to power the refrigerator while underway (or boondocking). The standard on-board tank will last for weeks.

If it gets uncomfortably hot (above 75 for the wife), we run the generator while underway and use one of the roof A/Cs to cool the entire coach. ...and keep the Keurig going.

When you know you're getting 8 mpg, you don't really worry too much about a little 4KW generator pulling a little extra fuel out of an 80 gallon tank.