If you use propane heat, it won't be bad at all, but you'll burn through some propane. If you use electric heat, maybe $75-$100 depending on how much the park charges for electricity and how warm you like it. There's a big difference between 50 degrees and 75 degrees of warmth.
2014 F350 DRW 6.7L CC FX4 King Ranch Ruby Red Metallic 158,000 Miles 4,450 Hours
2018 Cherokee Grey Wolf 29TE | Because I'm home, no matter where I am.
2018 Honda CB650F | Because the truck leans the wrong way when I turn.