For 2000, there is a lot to choose from. There is too much to type so, I'll attach a few links and that should give you an idea.
Remember that racks must be fat bike specific because the hubs are much wider than normal MTB hubs
https://www.adventurecycling.org/adv...-buyers-guide/
https://www.bicycling.com/bikes-gear...est-fat-bikes/
Let us know what you go with