Scott,
Strange to say, I've never been to Hull's Drive-in (For those of you who don't know this place, Hull's is a real drive-in theater here that has been taken over by a nonprofit organiztion and has been a great success.)
But when I was a kid in Tucson, AZ, we went to drive-ins amost every weekend. Left the top up on the '58 TR3 I had back then, however, because of nosey neighbors parked alongside (if you get my drift)! And this was followed by cruisin', drive-ins for burgers, S&W Rootbeer, and trips up into the foothills. Top down for all that. Nice thing about Tucson: you can drive these cars (top down) practically year-round.