Hey there! Brand new member, first post here. When Pacifica came out in 2017 I strongly considered replacing our 2009 Routan SEL Premium with one. I still may do that down the road, especially since my SRT10 replicas should bolt right up! They're 5x127 made by Quadratec and look great on T&Cs cousin. I don't see why they wouldn't work on the pacifica either! Plus 255/45/20 should be pretty close to 245/50/20 overall wheel diameter, so the speedometer should read pretty accurately.
P.S. Is there a facebook group related to this forum?