Re: Tow boat with Toyota V6
I have an '06 4Runner with the 4.0L V6. It is rated to tow 5,000 lbs. However, the 4th generation 4WD V8 4Runner is rated to tow 7,000 lbs. and the 2WD V8 is rated at 7,200 lbs. The V6 Tacoma can be equipped to tow 6,700 lbs.
My point is that by looking at the ratings of Toyota's other similar vehicles, I think you will be fine. The V6 4Runner gets the same auto transmission as the V8, and they are rated to tow up to 7,200 lbs. They also have the same wheel base, frames, brakes, etc. However, the V8 has a tranny cooler and a weight-distributing hitch, which are upgrades from the V6. The Tacoma, rated at up to 6,700 lbs, uses the 4.0L V6.
When you distill all of this info down, I would say that the vehicle chassis itself can tow up to 7,200 lbs., the tranny and brakes can handle up to 7,200 lbs (with cooler and trailer brakes), the engine can handle up to 6,700 lbs, and so on. You get the point. Of course, I wouldn't recommend towing anything at the max rating.
The weak spots of the V6 4Runner may be its weight-bearing hitch and lack of tranny cooler. These can be remedied for a few hundred $$, but I think they'll work fine for anything less than 5,000 lbs.