SOA (spring over axle) takes quite a bit of work to do properly......it's more than just flipping the springs.
Among the things to be addressed are driveline angles, steering drop & spring wrap. Not to mention that tires over 33" will probably grenade your stock rear end in short order.
It's not a cheap as it would seem....unless you want to end up w/ an undrivable rig.
Lots of people have them, & if you are confident in your abilities, or have somebody who can do it correctly....go for it!