I am seriously thinking about stepping back down to 33" tires and going with the Toyo A/T II in a 325/60/18, which is roughly a 33x13x18. Several reasons are contributing to this. I can't find the weight for my Nittos but they're heavy. The stock BFG's are 56 lbs and the Toyo's are 61 lbs. Not too much of an increase.
1) When I installed my new rims and heavy M/T tires, my truck lost a lot of power and the ability to hold speed up hills on the highway. It did not do this with the stock tires.
2) I have a baby due in July and the truck is pretty damn tall. Along with my reduction in tire size, I'm going to remove my lift spacers and block and go back to stock height. This will make loading crap in the truck much easier. 3" might not sound like a lot, but it made a huge difference crawling in and out of the bed.
3) Gas mileage dropped about 3-4 MPG with the taller, heavier tires. I stuggle to get 11 now and was easily able to get 14-15 before. Not the biggest reason to change, but it's a reason.
So, am I nuts?
Here's a few pics from a Titan forum with this same size. They are the extreme design...
