Looks like I have a lemon. Nothing but problems since new but I will only ask about my suspension noises

2020 Lexus NX 300 FSport3. At first winter 2020/2021 and about 3000 kilometres, constant loud 4 second creaking like a mattress spring when front suspension loaded such as speed bumps. Front stabilizer bushings replaced and noise stopped.

Now this past winter 2021/2022 past way through season, exact same noise started again. Of course dealership I went to has all smooth roads and no speed bumps so they could not replicate it but I gave them video with sound going over 4 consecutive speed bumps. So no work done and now with warmer weather, front creaking stopped for now.

Another issue, i now have 17,000 kms on vehicle and I rarely have much weight in trunk or people in back seat. I did have two passengers in back seat this last weekend and immediately had constant loud creaking rear left only driving on anything except the smoothest of roads. Even the smallest or cracks in pavement would cause creaking sounds. On city roads, the creaking is almost non stop. And regular knocking sounds as well although not as constant as creaking. Back seat passengers both agreed knocking and creaking only from left(drivers side) behind them.

Any thoughts? Rear stabilizer bushings perhaps? This is ridiculous. With the fronts, I get this loud creaking every winter with new bushings under warranty only lasting months before creaking starts again.

Thank you