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A couple of things to keep in mind.
First is that if your goal is to avoid freezing the water lines then electric heaters inside the rig are not going to do the trick. The furnace has to run to pump warm air into the belly where the tanks and lines are. This is less critical on the new 2007 models whose lines are far better insulated. But still it is a concern.
Second is that if you will not have a hard freeze then you probably won't have a problem. A hard freeze, as I saw it defined, requires 27 F or less for four hours or more. You could just drain the low point drains and tanks, then put a "blow out plug" on the city water connection, open all faucets and connect an air compressor to the blow out plug to blow water out of the lines. If you don't get serious hard freezes then that **might** be enough, without antifreeze. I'd be a bit nervous about an unusually cold spell hitting, though.
Third is that if the enclosed space your Montana is in is pretty small, a couple of electric heaters running outside the Montana to keep it above hard freeze territory might be enough. This depends on having enough heaters for the space, though. And that an ice storm doesn't cut the electric power.
Living in our Montana full time, when lows are in the twenties with highs in the upper thirties, one propane bottle will last us a week or a bit more. When temperatures are in teens and single digits all day and night, one bottle lasts us about three days.
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