People often will do a google search for something like "Toyota Tacoma Towing Capacity" and it will show up a figure of 3,500 lbs, but that might not be true. Honestly, Google should stop pulling this data and displaying it to visitors on the search engine page and they should just list websites, forums and documented pdf's that explain in better detail.
Towing capacity for the 2014 Tacoma V6 is going to change depending on your setup. If you have the v6 with the factory v6 tow package, you jump up to 6,500 lbs towing capacity with the access cab 4x4 or 6,400 / 6,300 lbs with the double cab short / long bed and 4x4 option.
This is straight from the 2014 Tacoma Sales Brochure from Toyota
TOWING,23 MAXIMUM (lb.) (SAE J2807 towing rating-compliant) Class-IV towing receiver hitch, transmission and supplemental oil coolers (transmission cooler not available on manual transmission models), 130-amp alternator, heavy-duty battery, 7-pin connector with converter, and Trailer-Sway Control (TSC)26 (V6 only) – – – P – P P Tongue load (4-cylinder/V6) 350 350 350 350 350 350/– –/– Tongue load (V6 with V6 Tow Package) – – – 650 – 640 630 Towing capacity (4-cylinder/V6) 3500 3500 3500 3500 3400 3500 3500 Towing capacity (V6 with V6 Tow Package) – – – 6500 – 6400 6300