As Scott said, be prepared for the burn off of manufacturing oils/dirt/dust.
Just be sure your propane is on and that you have purged the LP line by lighting a stove burner first.
R/V furnaces are HUGE users of propane and battery power.
If you are not plugged into shore power you'll want to turn the furnace thermostat down low over night and use blankets/sleeping bags to stay warm. One battery will likely get you through one night before needing recharged. If plugged into shore power then no issues with battery voltage as your on-board converter will keep the battery charged and supply ample 12v.
Keep an eye on your propane usage. In 30º to 50º weather you can easily use a 20LB. tank of propane in a week or less. (depending on thermostat settings) If you have a dual tank set-up with auto change-over, open both tanks and keep a watchful eye on the indicator so you know when one has run out. (usually in the middle of the night but with the auto change-over at least you won't have to go out in the cold to open the 2nd tank)
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel-Goodyear Endurance Tires
2017 Ford F-Series SCREW 4x4 - Factory Puck B&W Companion
TST Tire Monitor w/Repeater - Sinemate 3500w Gen.
Days Camped: '18=51 ☼ '19=58 ☼ '20=110 ☼ '21=94