Well, I am being sort of lazy today and I'm kind of old... too young to go to the original Woodstock though, my Mother wouldn't let me.
Hapless is 100% correct, even with tinted windows a parked vehicle sitting for an hour in Florida can get to insane temps... metal pieces will burn the ***** out of you until the AC has a little time to work. No way you are putting kids right into that thing. Either I or the wife shop, rarely together... its not like a grocery store is something new or unique.
Like I said, unless its a monsoon Florida afternoon rain... during the summer/fall months they can pop up out of nowhere... I take the cart back to the corral. Heavy duty storm, that cart is sitting right where I left it, too risky to be moving a piece of metal around with lightning happening.