Try posting this at the dealer forum:
Pricing and Dealers - Tundra Solutions Forum
One of the salesmen there (like Cory) will be able to answer. I think the fees are legit. The TDA is what the dealer has to pay for advertizing, the holdback is the typical holdback, I forget the other one. If you get an answer over there, maybe post back here to let us know what it all means?
In the SE region, there is no TDA, since the SE region does their own scam of advertizing.