 I have a 2007 Tundra, their is a Technical Service Bulletin (T-SB-0101_12 they know these trucks rust in particular areas. Regardless of age they know it rusts faster than normal. I have had topper on my truck as long as I had it and it rusted from bottom to bed surface. I am not talking about small areas but large areas 4-6" circles with. Very very sad!