After the safety checks, etc. here is my checklist.
I have the 06 Dodge Grand Caravan. BUT, when we were looking we found some things we never thought about.
Air controls per person in the front seat? I can be warm and my husband cooler so we can each adjust as needed.
Sit in the back seats. Do the set backs go up high enough if you are rear ended to support your back as much as possible? Head support on all seats? Seat belts adjust low enough to not choke shorter folks and high enough not to strangle tall ones???
When sitting in the back seats, are your legs ON the seats to the knees-or close??? Do they recline and stay confortable?
In the far back seats, do you have knee room sitting straight forward? Slouching? Same about the seat back heights. Air vents adjustable per person to the back seats?
sliding doors- automatic? If so, can you shut them manually without getting a hernea??
IF all the sliders and rear are automatic-do they also have a child safety catch? If they hit you, will they automatically reverse or will they crush you??? Think along a child's size when you check this part.
We found issues with these things in several vans we checked out. My older son is 6'3" (and still growing) and there were 2 that failed miserably on the seats and seat backs.
One Van felt like our knees were around our ears and the seats didn't sit high enough at the knees so we weren't "sitting", we were on our rear but thighs & knees were on air.
Another Van's doors were incredibly hard to close. I have back issues and couldn't close the doors without some pain, strain and sweat!!
LOVE the auto reverse on the sliders!!! I check it out pretty frequently to be sure it's always working correctly, even though my boys are older and it's not as important as if they were toddlers.
Also, look for extra plug ins for rechargers, games etc. My kids love that feature!! I have one in the middle seat level and one in the far back seat...2 in the front Keeps them very occupied on long trips.
Hope some of this helps you!