tacoma's can tow quite a bit, here's mine with a heavy load. I have gotten one tow weighed in at just under 5k. I would say suspension has alot to do with it. Now that I have my OME leafs it's a whole different ball game.
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2011 DCSB TRD Offroad, kings front and rear, TC UCA's, All Pro leafs, Timberin bumps, Relentless front bumper, CBI rear bumper and sliders, and other goodies