One thing to keep in mind - the Tundra has a 5 yr, 60,000 mile drivetrain warranty, the Chevy only has 3yr, 36,000. The Toyota also has a bulletproof reputation for making quality, long lasting vehicles.
It all depends on what is important to you. To find details on fifth wheel towing do a search at http://www.tundrasolutions.com
Oby - What does aftermarket airbags have to do with the price of tea in China? Don't you have a lemon Silverado?