Rear suspension question

All,
starting to feel some rear end vibrations on my 01 PreRunner double cab, was thinking about changing out the rear shocks and maybe the leafs. Problem is I'm not sure if it's currently stock or not. Can you tell from these pics?

 

Describe the vibrations and conditions they occur under.

Miles on truck?

Vibrations are much more likely to be tire related than suspension. One easy test is rotating tires To the front and see if the vibration follows

 

rear suspension looks stock. Vibrations can me caused by multiple things. I bit more information about your truck would be helpful.

 

Thanks for the responses. Truck has 226K. It feels kinda like the rear end is bouncing a lot, I figured with miles why not go ahead and refresh the rear suspension as I already did the front last year.

 

Bad tires, wheel lost balance or bent, bad CSB, unbalanced DS, loose lug nut to DS mounting, or defective ujoints.

 

White paint dot on leaf is original.

 

Then its time to do the rear suspension. I would also inspect u joints, carrier bearing and check the tires/wheels.

 

Rear springs look flat, shocks will make it ride better for now. But the springs eventually need to be addressed.

 

visually I got the same impression, that the springs looked kinda flat.