Haven't owned one but when I was doing my serious shopping, the used Challengers always seemed more lower/entry level. Not necessarily a bad thing as the price is favorable, but with the insulation specs you found it definitely sounds more like a warm weather, weekend model versus a full-time coach.
Are you looking at NEW models?
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Nick
1995 Coachmen Santara 360MB 36' w/slide.
Ford F53/460 chassis, 2020 Chev Equinox "toad"
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