Squeaking noise?!?!?!

So for the past few days every time i hop in my truck or set something heavier in the bed or just push on the rear bumper a pretty loud squeaking noise comes the right rear wheel area. Today i noticed it getting worse, inching up my driveway and going thru a drive thru starting then stoppin you can now hear the squeaking from the drivers seat.
Any ideas what this might be???
Thanks..

 

Way old thread...but I bet the sound was your leaf springs w dirt/sand in between. I fixed my squeak w tire intertube and some gorilla glue on one side and placed between leaves w truck jacked up. A crow bar is usefull for fully spreading them too.