I am also running a Tundra just like the one above with a cabover that comes in @ around 1000 over. I already had e series tires and the axle can handle it. I was leary of brakes as we travel through cascade passes a lot. I added air bags. Run em at 80lbs. Handles curves and rides great. There are no problems climbing with the truck fully loaded and letting the engine help with braking was a piece of cake even on steep passes in the north cascades. I'm not off roading with this setup, just car camping type places. But it does just fine. That all said, when I retire next year and start traveling up and down the Alcan each summer I will be upgrading to a GM 3500HD, but right now that Tundra is no far over weight than many of the rigs I see with triple slides etc. Probably less.