With all that rear end hardware that close to the frame, shocks aren't going to have much of an effect. You've got virtually no suspension travel unless you do some pretty serious frame modifications over the axle tubes. It looks like your truck was made to look at, not to drive much.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!