Looking at your pictures, the inside of your truck is very much being exposed to the elements...Ummm ya it has been washed and waxed a few times and regardless this is inside the truck and not exposed to the elements like the outside of the truck is. And the outside isn't rusted like that.
Good that your dealer is fixing this for you! There are tons of Tundras in Alberta and this isn't a common problem, so something was obviously off with your truck.Well, stopped into the dealer this evening and it wasn't a big deal at all. He said that they have had a few trucks come back with the same problem and that they will send it out to a body shop, sand out the whole sill and repaint it. I said that if it is rusting on the sill can we assume that there is the same problem underneath? All he could say is that we cannot do anything about stuff we cannot see.
Anyways, has anyone tried coating the door sills with bed liner or had it done by anyone?