Forgot to mention about towing...
I have towed with the truck occasionally. I have a 2001 Suburban that I pull my 5k camper with most of the time. I have used the Tacoma 3 or 4 times...it was well over the 5k limit of the Tacoma but the Tacoma handled it. I would be lying to say it hauled it as well as the Suburban, but the Tacoma did the job.
I just picked up a 6x12 low profile dump trailer and with my 4115 and loader on the trailer, I was surprised at how well the Tacoma handled it. I will use the Suburban most of the time, but I am not afraid of using the Tacoma if and when needed.
Now, like many have said here, load the trailer properly. Park your truck/trailer on level ground and place your load on the trailer and watch the tongue. Place the load forward of the axles and see how far the tongue dips, then move the load back until the tongue allows the truck to return to normal height. Then move the load forward until you see the truck dip slightly. Tow with it and if the rig stays level, doesn't dip too extremely at the hitch point,(too much tongue weight) or sway at moderate speeds (too little tongue weight) then you are probably pretty close to the correct amount of weight on the tongue. This is not exact, but it will give you an idea of the amount of tongue weight your load will place on the truck. Make a note of where the tires are on the trailer, (either mental or physically on the trailer) for future reference. This makes all the difference in towing. Of course the attachments on the unit will affect this.
As far as braking, when towing anything substantial and dual axles, I can say I have only ever towed with trailers that have brakes on each axle and can't imagine having anything less. I have had brakes fail on my camper and that is a scary thing. The Suburban brakes can stop the entire rig, but only until I could pull over and adjust the brakes on the trailer to get some braking back. Key here is understanding your brake controller and learning how to set it and adjust it for different conditions/speeds.
These are basics of towing that I follow and my Tacoma has done fine the times I have needed it to. If I was going to tow a substantial amount, i.e., more than 10 times a year or a substantial mileage, I would not use the Tacoma. Then again, I probably would not use a Suburban either but would probably buy a 3/4 ton chassis truck.
Hope this helps and sorry so long.
Mike