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We have used our 2002 19' Bambi for years in West Yellowstone in September, when night-time temperatures can easily be in the mid 20s. As long as you have 120v power for the forced-air furnace and disconnect your water hose at night, you should not have problems with cold overnight. With temperatures below freezing during the day, things get a little more difficult. If the forced-air furnace is providing the heat, the tanks are heated, but the gray and black-water dumping systems can freeze enough for the valves to stick. There are after-market heating elements to take care of that, but they take enough power (even though they are 12v) that you will want to have 120v shore power.
If you try to do everything with 12v battery power without a 120v connection, you can easily have problems quickly. Please don't forget that the batteries produce less power at lower temperatures.
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