Suspension Noise problems of the 2017 Nissan Altima

Nissan Altima 2017 loud rattling from passenger rear suspension. Vibration or traveling over bumpy conditions would create rattle noise. Vehicle has less than 16,000 miles and dealer stated that both rear shocks need to be replaced. After researching multiple Nissan forums have discovered this is a common problem not only with Altima models but with maxima as well. Dealer stated due to year it is out of warranty and received repair estimate for over $800. Dealer charged $50 for diagnostic even though I told them what the problem was. Had shock mount kit replaced on passenger side at another repair facility for less than $200. Loud rattle is now gone but shock was not replaced and is still making some noise over bumpy conditions. Driver side is currently not making any noise but probably will fail eventually. Contacted Nissan and they would not credit me for repair cost I incurred and would only cover half of the cost if I took vehicle back to dealer to have both shocks replaced. This is unacceptable and should have been recalled by Nissan due to high failure rate on parts with minimum mileage. They should be responsible for 100% of costs.