Winter fuel consumption Propane Furnace

Heating a 28 ft 5th wheel for a 10 day December deer hunting trip in Minnesota with average night temps -5 to +5 degrees and daytime temps around 25 degrees we normally use between 120 to 140 lbs of propane heating and cooking. That has been our average fro the last 3 years. Before that with a 24 ft camper trailer we averaged 100 - 120 lbs using a direct vent heater. I have used a catalytic heater in smaller trailers and they are far more efficient but generate way too much humidity to be practical. Water will be running down the walls after a day. We use a Honda 2000 watt generator and it powers the furnace, lights, refrigerator and microwave. Running 18 hours a day we use an average of 14 gal of gas for 10 days. i can't tell you numbers of BTU's or R-value of insulation just if I was leaving on a 10 ice fishing trip today that is what I would bring.