Strictly opinion to be taken with a grain of salt, if that but...If you are looking at situations where you really need to air down (be it rocks or snow) your wheels are likely to take a beating to a certain extent.
If you are looking at dropping the kind of coin that high end running gear commands why not get a set of "beaters". Just a simple steel beadlocks with some REAL off road tires (Trepadors, MTR Kev's, siped/cut KM2's, etc) for screwing off and stick with a reliable, good wearing AT for the street.
I <3 my MTR's but they arent a 35,000 mile tire, I like expensive wheels but dont want to see them get super rashed from what I know I'd put them through. If I can address both of those problems in one swoop that's the route I'd take.