Just remember, furnaces are the biggest consumers of your 12v battery power.
If you have a single 12v battery and no electric hookups, running the furnace all night can completely drain the battery by morning.
For dry camping or boondocking, you really need a minimum of two deep cycle batteries and a way of recharging them, either by generator or solar panels.
And don't expect your tow vehicle to recharge a drained battery. You would need to drive for hours to do that.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC