I had the same problem and I replaced the shocks and it fixed bouncing when going over pot holes and over railroad tracks. I put on stiffer shocks and the rear is much worse over speed bumps and the front is more firm so i can take corners faster.

Also try not to go throught pot holes!!!
And my truck also would have the inside tire jump some on tight turns which was mostly fixed with new shock as long as I don't gun it.

 

also you might wanna take it to the stealership and see if the recall on it has been fixed or even if it had a recall

 

FActory shocks on these trucks are good for 50 thousand miles or so then your ride quality goes to crap.