I have had my 2006 Explorer v8 4.6 3 valve for almost 10 years. I have towed various trailers anything from 3 to 6k lbs. The 6k was the most I would ever do even though it's rated to tow around 7100 lbs. But anything around 4-5 k it was pulling like a locomotive. I am still surprised how much tq this little 4.6 puts out. Now, I did most of it on flats of NY, NJ, PA and east cost with small and medium hills, but looking at that boat, I want to laugh - no offense, it should pull that like nothing.
And just FYI for all, that generation explorers, all v8's came with 3.55 and 6R tranny. The tow package just gave you the tranny cooler and 7 pin connector, and it would bump the tow rating from 3500 to 7200 lbs - weird.
