After driving my rig with 33x9.5x15's with new shocks and an anti-inversion shackles for the front and rear, and after doing a LOT of research and looking and trail riding with other rigs, there is no way I would consider a SOA (spring over axle) conversion. It is just not needed and there are way to many variables affected for me. In my opinion, a SOA really sets up a stock rig too high.
This rather stock setup with 33's runs fine in most places. The tires do not scrape under full articulation, even when loaded down. In the future, when the BFG all-terrain tires were out, I will install new 2.5" lift springs (IronMan 4x4 from ACC Toyota in Atlanta -
ACC Toyota Truck & Land Cruiser) just so that I will be able to install 33x10.5x15s. There a quite a few more tire options in this size.
By the way, Pritchett Tire in Cornelia, GA has BFG ATs in 33x9.5x15 for those of you that may be looking for this size.