I've got a DX3 so can only advise anecdotally but we camp at Breck almost every year (headed there now). Things go pretty well down to about 0 but then it starts to get interesting.
Statements like "warm enough" start to have different meanings for different people. You're not going to keep it at 68 most likely. That said with the right clothes, ample blankets and a plug in space heater we make it work well enough to keep wanting to do it.
One things for sure, cold that cold will quickly highlight the areas that need improvement.
If you're up for adventure I'd say may as well try. If you want a peaceful vacation, a vrbo may be a better bet.
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2016 Dynamax DX3 - Big Blue
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