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I couldn't find a listed weight either, but I would guess frame and fork might be as much as 800g lighter based on the material, I could easily be wrong. 800g is and isn't a lot, if the functionality and price is much the same then it is quite a lot to me. I've cut weight off all my camping gear and climbing gear over the years and in the end the little savings make a big difference, in those terms 800g is huge. But as mentioned before price and functionality come first.
Is weight of frame really such a concern here?
I can't find a published weight for the Fortitude, but will it be considerably lighter than the Ogre or Troll? 500g perhaps? That's a tiny proportion of the total vehicle weight fully loaded with luggage and a human.