looking to trade my 2018 Giant Anthem 2 in mint condition size medium for a comparable in price 2017 or 2018 Trek or Specialized fat bike size medium. The fatbike is a better fit for my style of riding.
Doesn't it have boost? My understanding is that it can fit up to 2.6 tires.
Granted this is nowhere near fat bike territory but why don't you get wider tires and see if that works for you?