Jeremy P.
Adventurer
If I was towing 4k on a regular basis, I'd sell the 4runner and get a Sequoia or a Nissan Armada. 4k is close to the weight of a V6 4runner anyway (mine was 4450.)
That would defeat the purpose of the vehicle in my case. I'm currently able to tow the travel trailer to Moab and run some trails (ie Golden Spike) with the same vehicle. For non-fourwheeling trips I use the Duramax to tow the trailer.
The regear helps with towing the trailer on the highway and I can maintain around 60-65 in overdrive unless going up major hills, and I tend to not push it too much, slowing down rather than having the engine screaming. I added an aftermarket hitch which increases the tow rating to 6000 pounds and also added a transmission cooler. The vehicle is very stable towing the trailer (with the weight distribution hitch set up right); I just would just prefer the torque of the V8 engine.
For example at 2500 rpm where I am close to while towing, the V6 produces about 250 ft-lbs of torque while the V8 produces around 300 ft-lbs (around 20% more), which is more important than max HP numbers.
I'm lucky I found one without the sunroof. I'm 6'6" and when I drove one with the sunroof my head was mashed into the ceiling.