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Originally Posted by mrclueless
I would guess they lessen the amount that the rear end drops under load??
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That's probably true but since I don't tow, can't testify to that for sure. I do know that the helpers lower the back end as measured at the rear wheel wells by about 1/2-3/4", provide a slightly tauter rear suspension, greatly reduce rear tire hop, and completely cure the clunk problem. The bonus was that the surging during cruise on slight downhill grades (seems to fit your description) was also eliminated. That condition is NOT the Hill descent function that a couple of earlier posts mentioned.
Keep in mind that the helpers are not actually functioning in their intended role to provide stiffer and higher load capacity rear springs, but instead act as traction bars preventing the spring wrap.
Give 'em a try, pretty cheap and about 1/2 hour install. Would like to hear if they solve your problem.
Good Luck!