Dealers will always try to low-ball you, especially on a vehicle that's been in an accident. Even on my last car, a 2009 Civic Si Coupe in a rare-ish color with barely 60k on it (in 9 years) that was in flawless condition, the dealer tried to tell me that it wasn't worth as much because it wasn't a one-owner car. So what, it's a 2-owner car, big deal, right? Then he shows me the Carfax and claims it's had 4 owners, which is technically correct since the car was originally purchased through a Honda corporate program, but still, nitpick much?
TL;DR - prepare to get hosed if you trade it in. You're better off selling it yourself, since Tundras have above-average resale value and not everyone bothers to get a carfax report on a used car. Also, you're not obligated to disclose the accident damage when selling it, so if they don't notice and don't ask, don't volunteer that info. (Yes, it sounds shady, but that's the car business.)