That looks kinda funny. Be sure you ride it on the road with your suspension very firm or locked out or you'll be miserable trying to go fast. You can use a normal 2.0+ mtb tube though not recommended because you really have to watch how you stuff that much tube into the tire. Go ahead and pick up a 28-32mm tube, it will weigh much less than the 50mm tube.
No experience with tubeless...
No experience with tubeless...