Electric level up instead of hydraulic. If you do a search for one of their brochures it should tell you how they are saving weight. . Frame has already been mentioned 10" verse 12" and the axles were 6 k instead of 7 k without some other stuff that I can't remember. But they are differently lighter. I actually like the sandwiched foam as it would be good R value and quite strong. I know the Montanna floor is just OSB with a black plastic plastic cover over it, not even marine grade plywood which I would have preferred or at least marine grade OSB.
Take all of this information with the fact I have been wrong before but I do try to be right.
Tom Marty
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