Buy the newest and lowest mileage one you can afford. Heated seats, steering wheel & GPS are a must
They are pretty good vehicles 2016 and later, many issues before 2016. Oil cooler cracking, body modules, cyl head problems, a hood corner corrosion issue that went away after 2016
Look for an R/T, GT or a fully optioned SXT, Avoid the ones with the actual ac unit in the back [separate controls on the lower center dash]
The R/T and GT ride better than the others.
The 2019 is way better than the 2016s
2020's are scarce.
You will find most used minivans are former rental vehicles and are very clean - the non rentals get more abuse, wear and tear.
Later ones came with Michelin tires that will last at least 50,000 miles.
There are web forums