Compared to many other car brands, I'd say Mopar stuff was better designed and easier to work on.
I don't know about the 2003 caravan, but the water pump on my 1999 Carvan was very easy to replace. I did install the Gates belt/idler/tensioner kit that replaces the tensioner and idler with groved pulleys, and the belt is groved on both sides so it can't slip off.
Replacing the waterpump on a Pontiac Grand-Am with the quad4 is a real pain. It's chain driven, I think off of the timing chain, mounted next to the firewall, bolts to the block, timing cover and thermostat.