Personaly, i wouldnt run a spool up front even with 30 spline chromely birfs and hydro assist. It is just really hard on the whole system. Buddy trying it for a while and he constantly broke more parts....with smaller tires taking the same lines. With the wide BS wheels we run....then add wheel spacers...our front tires turn in such a arch...that the toy axle really needs to be able to ratchet fast in the courner. If it was a comp rig and didnt see any distance it would probably be fine. But on a trail rig...we spend to much time driving down "trail 1" with our hubs locked.
If you dont care about tire wear...the spool in the back is great and affordable.
My vote....full spool in rear.....some type of locker in the front. (and longfields
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Seth