Loving the 2011 5.7L 6.5' bed tundra!
I had a 02 GMC 3/4 ton short box extended cab with the 6L gas motor that I put a turbo on. always 10mpg until I turboed it, then 6-7mpg. Nice truck as well, sold it with 142K. I thought I would end up with a duramax but drove the tundra.
I put airbags on it, and run a sled deck just fine. All summer long it pulls a mastercraft x2. Amazing brakes, good power, but the seats aren't as comfy as the chevy's, and it rides like a truck more than the chevy.
I get ~14 around town empty, 18 hwy @ 60mph, 10mpg with sled deck 2 sleds and 70-75mph, and 10-11 towing boat. this is with 3" lift and larger Toyo MT 275/65/20.
This has been beat to death but here goes...... air bags or not you are still overloading the truck with a sled deck, 2 sleds, gear and passengers. I guess if you are running 10 ply tires, airbags, and take it easy you would have no problems. The only thing I would be concerned about is if you got into a wreck, insurance company might have a problem with this.
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