you would be surprised a good weight distributing hitch and trailer brakes it will likely tow real well. especially the extended cab models with out the equalizer and brakes any thing over 3500 pounds would be a white knuckle ride. these new vehicles are coming with some huge brakes now part of the reason for these big wheels all that brake won't do you a bit of good with out the weight on your wheels to control it.
My VW Touareg weighs right at 6000# and is rated to tow 7700#. I've pulled all 7700# once, and it was, probably closer to 8300# instead of 7700#. It was a fairly short trip, all local/rural roads so I was pretty much the only one on the roadway.
PULLING the weight was not the problem, a good trailer, hitch, trailer brake combination will allow you to PULL over weight pretty easily. But stopping is the challenge. I had a new trailer with upgraded tires and brakes. It still took extra distance and extra time to stop. Never felt like I was not in control but when the load is significantly over the weight of the vehicle
(in this case over a TON extra) it is sort of like the
"Tail wagging the dog."
The Tacoma is a "compact" pick up truck. It is not as big/heavy as the Tundra.
I'm curious how much the 2015 Tacoma weights? The current 2014 model only has a maximum GVW of 5500#. I would not want to tow 9000+ pounds with a 5500# vehicle.