ok, so I own a 2011 2.7 Double Cab Tacoma and this weekend had to tow a old 18ft boat, I wasn't sure and to be honest I was really scared about it, Thought that I would be pushing my truck too far so I started to do my research, and i found out that it was a doable thing I don't know the exact weight of the boat and trailer, but its like a 1975 old boat that looks big and heavy.. I was worried about pulling it out of the water on a stiff ramp full of seaweeds without the power of a V6 or a 4x4, but man his truck really surprised me today.. Started to pull the boat and i would let the engine on idle just to see if it would move and it did, on a flat the truck started to pull the boat without me touching the gas, that right there gave me confidence to keep on going, I towed the boat for like 45 miles one way with no issues at all, doing 50-55 MPH and not feeling the truck being overwhelmed, i mean i felt it heavier but nothing too bad, I drove really decent (rare on me) did not push it a lot, just let it take its time to get to speed, DID NOT even felt it weak pulling the boat out of the water...
ohh i forgot, mine is an automatic, so if you have a manual, MUCH BETTER =)
So there you go.. hope this helps clearing doubts =)
Note: I don't recommend doing this, first find out the weight of the boat and then take it from there, there is a 3500 towing limit that should not be exceeded.
I wont do this too often either unless i take the boat to the weight station and if its under the limit ill be fishing every other weekend.