Most of those aftermarket single stabilizers are the "charged" type and really intended to offset the radial pull that some larger tires can have. (though I have never experienced this). If your truck runs straight now adding a charge stabilizer can actually add some push/pull to the steering.
Duals obviously counter act each other so you won't get that stabilizer push/pull like you might with a single charged unit. Duals are a lots for looks as well as far as I am concerned. Unless you are running some really really big tires I don't see the need.
I've never had the need for a aftermarket stabilizer. In my experience if everything is aligned, balanced and tight up front the stock is more then up to the job. A lot pf people tend to use them as band aids trying to mask a real problems instead of rectifying the issue.
I'm leveled running 35's with 67K miles on my stock stabilizer and my truck drives like a dream.
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