Low tire tread life is somewhat typical of OEM tires. Our RX400h needs tires before they had 22,000 miles or so, because of wear due to the tire compound and slight out-of-alignment condition. The dealership did not charge me for an alignment but I had to pay for the tire replacements. Aftermarket tires typically have much longer life than OEM, and Michelin tires are often rated very highly by Consumer Reports with lifespans ranging from 40,000 to 100,000 miles, depending upon the category. Example: Their LTX A/T2 All Terrain tires have a tread life rating of 100,000 miles, whereas their CrossClimate All-Season SUV tires are rated at 40,000 miles of tread life.
Regarding your headlights, have you called Lexus customer service at 1 (800) 255-3987?