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I think on the heater you mean 1500 watts here...........which is quite a bit different? And when you say "safely" are you meaning due to the amount of power used? I take it you don't want to use the LP fired furnace in the trailer? IF SO, yes, you can use an extension cord of at least a 12 gauge size so long as it isn't too long. How far is this to the nearest 20 amp outlet? Please get back to me with this information and I can make some recommendations here. All follow ups are included in our fee and fully expected.
Just checking back in to see if you found this information helpful and did you get it resolved or do you need more help here?