Maybe. For cheap rollers I'd give em a shot.
But, I'd bet the fronts are too tall to clear at full lock, and the rears might be too close to the fender.
I'm assuming you changed the rear pattern too. If you're using adapters, all bets are off.
(Are you dead sure the wheels are 5 on 4.5? I thought a caravan was a front driver with 5 on 100.)