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Being discs, there may be less options for 36h hubs, but I know there are many good ones out there, like Deore XT etc etc, although you will have to look into the specifics of how wide the rear hubs are on your bike just to be certain when you look into options of wheels, not to mention if your bike has thruaxels (or whatever they are) and not quick releases, and making sure they have the same disc mounting system (number or bolts or a single thingee, handy if you ever had to pilfer a disc at one point)
Looking at the Trek website, they look like they are just quick release hubs, not though axles. The fork has lawyer lips which is a dead giveaway.