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What size wheel/tires are y'all running on your trucks? The ones the PO had on the truck are too wide and rub on the shock towers pretty good.
Looking at the picture of your truck the tires do not appear to be too wide for the rims. You most likely have a backspacing/offset problem coupled with a rim that may be to wide. Most rubbing problems with twin "I" beams usually happens on the radius arm when the steering is at full lock. Unfortunately you may have to get different rims to cure you problem. My truck is an F100 I have 17X8's with 4.25 inch back spacing 235-60-17 tires on the front, plenty of clearance.
I'm convinced I need smaller rims, the tires and wheels do pair well as far as sizing goes, so I either need to find something with a little bit of backspacing, a rim that isn't as wide, or both.