Case in point....
I have a 2007 DC SR5. It has a sunroof (Toyota OEM). I didn't know it when I test drove it last year - but it was a dealership add-on (not built from the factory). As a matter of fact - you can't even get a DoubleCab with a sunroof from the factory. The original owner must have insisted on it - so it was added at the dealership.
You'd think that Toyota OEM Parts installed by Toyota Techs at a dealership would be a good thing, right??? Wrong.!
I love my Tundra - but I wish every day the damn sunroof wasn't there. It has already blown all my fuses once (had to take it back to the dealership - they kept it for a week to troubleshoot). That's when I found out it is considered an "accessory" not covered under my extended warranty. They squared it away for free ('cause I had just bought it from them). But still it acts flaky (opens by itself [just a crack], I hafta' close it almost every day is seems).
I think the original owner probably traded it back in 'cause he hated the sunroof and regretted putting it in... If I had known about the whole thing before buying - I would have looked for different truck. But, when you get in and sit down, it looks "100% stock" I had no idea it wasn't.
My advice is stay away...