If you are going to run hubs you are actually better off spooling the front, and selectable rear. As long as you have hydraulic steering of course. But you wouldnt run anything over a 35 without hydro assist or full hydro anyways.
That setup also makes true cutting brakes possible.
You stay in 4wd and just brake 1 rear tire, then pivot on it in 3 wheel drive.
Thats how most comp guys run a spool/selectable combo.
You get all the positives, and none of the negatives. Still get simplicity of a spool, and reduced cost. Turn the hubs out (or pull slugs) on the road and get normal tire wear.
You want to make sure you have a good steering angle to make it work though. You should able to clearence stock type knuckles and axles to get right around 40 degrees which would be perfect for the above setup.
basically you need to be able to turn tight in order to overcome the scrub in the frontend from being locked solid.
There's tricks you can do with the steering angle (ackerman) to further help with that as well.