you will feel that when you hit bumps the truck tends to rock back and forth for a bit instead of just a hard jolt. you could jump on the cargo area in the back of the vx and feel how much bounce there is, it should not rock back and forth more than once or twice. replacement of the shocks is easy from what ive seen, i would not replace with OEM shocks unless you have some cash to spare as they are like 400 per shock (x4) to replace from the dealership