The old Caravans were easy, just use aftermarket crossbars that use towers that fit in the raingutters.  Fortunately when Dodge did away with raingutters they introduced an excellent factory rack rated at 150 pounds.  The Durango for example uses two crossbars with either Thule's excellent Tracker II system or Yakima's Railrider system.
 

Med Top Line on Durango (click to enlarge)

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