Take a vehicle with an actual "bed" to a drive-in movie? Where's the challenge in that?
Real men take vehicles with buckets seats in the 1970's then wonder why their backs bother them so much when they get older.
My car had a police style spotlight, and when the steamy parts in the movie came on with some naked parts, I would place the spotlight on the screen. Everyone would go crazy honking their horns and yelling as they could not see what thay paid to see.
My car also had a large speaker under the hood and when an important part in the movie was coming up, we would announce, "Sanck bar open another fifteen minutes after that we will close for the evening, thank you!"
We laughed so hard we almost pee'd our pants. Yup, the good old days.