Amp draw versus heaters is my usual (and not well researched) question. Coolant and engine oil. Then battery blankets.
2004.0 DODGE Ram QC/LB 2500 2WD/NV-5600 305/555 ISB. 7,940-lb. Stock. 200,000 miles/5000-hrs @ 40-mph average.
1990 35' Silver Streak
8-cpm solo & 11-cpm towing; 21-mpg average past 54k-miles
Sold: 1983 Silver Streak 3411