My 2k GXE max has 29k miles on it but the ride is too bumpy (partly attributed to bad roads), but everytime it hits a bump, my steering wheel sharts shaking and the rattles are too much, like the car is falling apart.

I thought maybe the shocks/struts were are fault, but the Nissan dealer found nothing. Is it because it is covered under warranty and they don't want to admit the problem ???? Anyone knows how to make sure the shocks and struts are at fault ?