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If sag is the problem then the shocks aren't what you should look at. Air bags or Timbren rubber springs will keep you level under load and ride more or less stock when empty. You can always add a leaf or two to your spring pack or even one of those bolt on add a leaf if you don't mind those. Now if there's too much bounce shocks would be a nice upgrade and Rancho and Bilstein also offer some nice units in addtion to Munroe. You can probably search for lots of reviews on this forum. I have Bilsteins and like them with fairly heavy loads.