There is only so much insulation you can get into a 2" wall - true 4 season campers have thicker walls and other attributes that makes them 4-season friendly. Of course, many brands label a camper 4-season but dedicate a page or so in their warranty to saying that the unit isn't intended for extended living, cold weather living, etc.
So, if I were looking to truly have a rig to "live" in and I expected it to winter anythign harsher then a Florida winter it would have to feature more robust construction and a warranty that reflects full timer use.
So in all fairness, living in your Rushmore in a winter climate is expecting the unit to perform against it's design limits. JMHO.
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Mike
2013 Jayco Eagle 334RBTS
Crossroads Forum Lurker
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