Front Suspension Wheel Bearing problems of the 2014 Toyota Camry

Complete replacement required of both rear wheel bearings, backing plates, brake calipers, pads and rotors, with recommended replacement of tires, on a vehicle with less than 52,000 miles. Because the vehicle is out of warranty, the initial repair estimate was almost $4000. 00. The dealer, however, agreed to repair for about $2500. 00 (pass through cost of parts). This matter came to light upon hearing a 'screeching' noise when the vehicle was moving - the screeching noise suggesting a wheel bearing was failing. Manufacturer alleges replacement is needed due to exposure of these parts to road salt. However, I have owned numerous other vehicles that were exposed to road salt and never experienced such problems. Contrary to the manufacturer's allegation, I suspect a design or manufacturing defect in these parts. In fact, about the same time as the above problem, another like vehicle that we own (2017 model with about 15,000 miles) experienced a frozen rear brake caliper (allegedly for the same reason, namely, expose to road salt) that is being replaced under warranty.