Equalizers and Sway Bars

Since I am new at this and am having a little trouble figuring out how to use this board, please forgive if this is not properly posted. My questions involve Hitches and Sway bars with a 3124. I would like to hear from some of you about the following: 1) Experiences with sway and fishtail in the case of panic stops? 2) How crucial are equalizers and sway bars? I am planning on towing with a full size Ford van with a 302 V8.
3) Is anyone familiar with the Hensley Arrow and does anyone have any experience using one? 4) A corollary of the previous question-Are they worth the cost, since they are very expensive(at least to me)? 5) Finally, if they are worth the cost, will they fit on a 3124KS, both in an open and a closed condition?