We lived in Santa Fe for a number of years. We had dirt roads, as well as the terrain you mentioned. We started with XTs, and then "graduated" to X2s. I don't think I would be comfortable on dirt roads at any substantial speed, with an I2 with "aggressive tires".
Besides the obious difference, the X2 (and Xt) use low tire pressure which works well with rocky and sandy terrain.
Just my opinion, based on no personal experience with a modified I2.
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