We don't even have a vehicle right now that holds all of our kids, ha. (Our 12-passenger Transit will be here this week though, we pray!) So between that and the general chaos that happens when children are in shopping carts and walking the aisles, I much prefer to shop alone. Or better yet, take advantage of Walmart pickup!
I realized recently, though, that eventually (like when I'm sleeping again) I should at least take one at a time to the store so they can learn more about wise grocery shopping. I used to always take our big boys back when they were little. They learned so naturally that I took it for granted.