41mm is ideal for a 2.8 to 3 inch tire. I run a 29x3.0 tire on a 42mm rim on my winter bike. Fat tire bikes are generally 65mm and up.
No shipping from China required as they are name brand wheels from US based company with a few brick and mortar retail locations.
I didn't pull the trigger as I don't have a bike to put them on. I'm generally in the $750 to $800 range for a generic rim on DT 350 hubs so $999 for these is a pretty good value for high end hubs and name brand rims.