Sal I see that you are running the 4.7L V-8 like mine. I tow a trailer with mine and have noticed a significant reduction in power since moving up from the stock tire size. I can even tell the difference starting from a dead stop (especially on a hill) when not towing. I knew there would be some power reduction with the larger tires, but I was suprised it was so noticeable. Have you considered (or is there even a way to know) how much power reduction 35" tires would cause? Would the 4.7 still have the power to mount the rocks and obstacles you would be able to clear?