100,000 miles
You don't change the belt because it has a timing chain.
timing belt
A 2012 Dodge Caravan would have the 3.6L V6. That engine has a timing chain which does not require replacement unless worn.
A 2013 Dodge Caravan uses a timing chain.
Timing belt.Timing belt.
A Grand Caravan does not have a timing belt.
Chain
A 2008 Caravan does not have a timing belt, it is a chain.
The 2.4L has a timing belt.
Timing belt. Replace every 60,000 miles.
Timing chain