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To properly answer that question, more information would be needed:
<UL TYPE=SQUARE><LI>Truck's Empty weight.
<LI>Truck's GCWR. (gross combined weight rating)
<LI>Truck's GVWR. (gross vehicle weight rating)
<LI>Weight of truck's cargo and passengers.[/list]
But, a seat of the britches or off the cuff answer would probably be somewhere around 13,000# for that year Ford with a dually crew cab, a little more if it's a regular cab.
'11 GMC Acadia SLT AWD
'11 GMC Sierra 1500 4x4 Extended Cab