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The problem with any vertically positioned stabilizer is that they do a good job preventing movement from up and down directions but they do NOT prevent any side to side movement as well as we'd like. That's where a JT system or any other side to side preventative is needed. You can have all the vertical jacks you want but as you move through the rig and cause ANY side to side movement, you'll feel it.
The shortcoming of a tripod which has some side-to-side prevention since the legs splay in several directions is that it only works at the front cap and the remaining back part of the trailer will move side to side. If you want to stop all movement, then a JT, BAL or SteadyFast system is in order. I've been in these rigs and they are almost rock solid, or at least way better than my rig that has only vertical support (and a tripod).
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