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Welcome to the forum. If you don't know the answer, you came to the right place, there are no silly questions here.
Some people would say that you should turn them off (no open flame) when you are fueling your rig.....and then there are others who would claim it is impossible to start a fire...not sure how they know, but that is what they say.
Normally, it only takes about 30 minutes to heat up the trailer after stopped...and about the same amount of time for hot water.
One thing to think about is that the furnace fan uses lots of electrical energy and is a pretty big drain on your DC batteries.
I would think it would be advantageous to probably turn the LP furnace on if it is below freezing for about 30 minutes while driving, but if not freezing, wait until you get to your destination to turn the heaters on....or, you could travel on a day when the temperature is above freezing and not worry about it.
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