After loosing a few beads on trails and having a heck of a time getting them to reseat I got beadlocks. Started with Allied wheels which are a outer beadlock only. Had some issue with burping air on the inner bead on some of the steep side hills here in WA so I went with dual beadlocks after that. Most will say that there is no reason to run dual beadlocks and I know it is overkill but I like having it.
Most of the people in my club run some type of beadlock. Many of them run the Staun inner beadlocks and they have not had any issues.
http://www.offroaders.com/directory/products/Staun-Internal-Bead-Lock.htm
Part also has to do with the width of the tire and rim. Some rims will hold a bead better than others. I was running 33x14x15 tires on 12" rims here and had only dropped down to 10-12 psi. I like a 8" rim for 12.5-13.5" tires but these were what had come on my Jeep when I bought it.