Will a Dodge Caravan 15 in rim will Fit my Ford.

Not even close. Chrysler has always had a lot of parts interchangeability between models. Ford has had very little, but especially they don't try to make their stuff fit on other brands. Their bolt circle is smaller so you're done for right there. You also have to consider the shape of the inside of the wheel and its "offset". Either of those could cause the wheel to rub on the brake caliper. When offset changes it affects a little-known secondary alignment angle called steering axis inclination, (SAI). That angle affects handling and braking. Shrewd lawyers and insurance investigators love to find those kinds of modifications on the other guy's vehicle. Stick with the Ford stuff.