Randy, do not be afraid of a v-6. Especially Fords Ecoboost 3.5. I have owned many a truck and this is the most powerful gas engine of any of them I have owned. Never had anything larger than a 5.4 liter engine though. However this engine puts them to shame. Good milage when not towing, and when towing it gets like any other truck 11-13. Pulls my heavy 18" glass boat just fine and used to pull a 28 foot tow behind camper. Has the most room in the back seat of anything I have ever sat in. At least it's worth a look at
The Ford with an Eco-boost is the top performing engine/tranny combination for mileage and torque, no doubt. Yet, when you make this truck a serious off-road rig, a lot of the stated mileage is going out the window due to changes in the aerodynamic stance of spoilers and molding. And, the greatest decrease in mileage comes from a lift, which is going to be required with anything other than a Power Wagon.
I suspect the Eco-boost will still get the best mileage, even with some after-market modifications. And, for off-road hills carrying heavy loads, you want your torque to come at the lowers RPMs possible, a place where the Ford leads all others.
Making this truck as off-road capable as the Titan, Tundra, and Power Wagon seems to be a bit more of a challenge according to some of the after-market guys I have spoke to. It can be done, but they have told me of what it will take, a bigger project than the other three.
I just came upon this post and didn't read through all the posts but my vote is Tundra...all the way! I think I saw a couple posts in regard to no chains in front. There may be a way around this issue...but not sure.
I spent 2 years researching and looking for a great buy on a truck. I ended up getting a 2008 Tundra with 35,000 miles off Craigslist. It was driven by an older lady that kept it garaged! It pretty much looks like new and has all the bells and whistles. It even has a matching topper plus carpeted bed/topper liner, leather, etc.
One thing I would make sure of if you decide on a Tundra is to go with 5.7 rather than 4.6. The 4.6 seemed pretty gutless to me and got about the same gas mileage. I also liked the room of the full size Tundra rather than smaller bodied Tundra/Tacomas. There seemed no benefit with the smaller frame/body other than a little easier to maneuver through tight 4 wheel situations. I also went with the 4 door double cab rather than the crew max. It was important to me to have a little longer bed.
I really don't think you'll beat a Tundra for quality and dependablitly which was my deciding factor!
Good luck with your choice!
The Tundra is getting serious consideration, no doubt.
But, lack of a locking differential is a HUGE negative. I am at a loss as to why Toyota would not put that on the Tundra, when it has it one the Tacoma TRD Pro. I'm not the only guy who finds that as a big negative. All the off-road writers point it out as a serious shortcoming, in spite of Toyota's assurance that a limited slip differential is as good as a locking diff. That shortcoming is why some custom shops have found a market for building after-market kits to solve the issue, albeit at a handsome price of both equipment and installation.
If there is a way around the front chains, I've not found it. The only way I can think of is as someone mentioned earlier; go to cables on the front, rather than true chains. Not a very good solution.
The Toyota reputation for dependability is a big plus. Yet, I am not sure I could ask for more dependability than I've got from Nissan over the last ten years. Right now, the Titan has the top place on the dependability ranking, due to my personal experience of 250,000+ terrible miles without a single mechanical issue.
I've put together a spreadsheet with every variable that is important to me, comparing the features of the four trucks I am considering; Titan,Tundra, Power Wagon, F-150. If someone else was going through this process they would consider different aspects and out them in a different rank of priority due to different intended use.