A famous outfit in RV ride/handling is Henderson's in Oregon. I visited them and noticed that they stock, sell, install what they think is best. Roadmaster sway bars for example. Premium price over Hellwig, but that's what they like. They sell lots of Roadmaster stuff, but they use Safe-T-Plus and not Roadmaster's slightly less expensive Reflex. What I noticed is Reflex uses one coil spring, so Center is where that spring is neither compressed nor stretched. In S-T-P, there are two opposing coil springs, and they're shielded under a cover. We've had one report of an S-T-P failing with a broken spring, locking the steering. That was in very severe use. My choice would be the S-T-P if I was buying one.
