2005 Toyota Sequoia body & structure problems

There is excessive rusting of the undercarriage on my 2005 toyota sequoia. While the vehicle is 5 years old it has less than 38k miles. The rust is literally flaking off the frame rails, shock towers, and most other structural components. Since there is no "perforation" toyota classifies the condition as normal. My concern is that in a crash, I fear that the structural stability may be compromised due to toyota's metalury decisions.

The plastic latch on the rear door of our 2005 sequoia broke in november 2011. We had it replaced at the dealer for a cost of $300. Fourteen (14) months later, the plastic handle has broken again. This car has only 75000 miles and has been garage kept its entire life. The dealer offered a discount on the labor but nothing else. The mechanism to adjust the side view mirrors was adjusted several times during warranty but has never worked properly.