I always do and agree that is the way they were designed, however some folks are concerned about the open flame when they refuel and correctly point out that, if you don't open the doors, you can travel all day with out the refrigerator working and the food will stay cold.
This is an "agree to disagree" issue.
Joe & Barb
2006 Granite Ridge 2900GS
2015 Montana High Country 345RL