The new Scorpion DVD (released in 2010) is far superior to the old VHS release of the film from the 1980's. The DVD is anamorphic widescreen, and has a couple of extras: an interview with the screenwriter and a trailer preview.
My four-star rating mainly pertains to the new DVD itself. The movie is fun enough, but not a drive-in classic. It was released in 1972 under the title HOT SUMMMER WEEK, and then later retitled GIRLS ON THE ROAD. The girls only spend the first half of the film on the road, so the retitling is a bit exploitative (wow-a drive-in movie being exploited?).
One of the girls is played by Kathleen Cody, who mainly played "the girlfriend" or "the cute girl" in some Disney comedies. It's fun to see her get a little trashy in this film, and a nice change from her normal goody-two-shoes personna.
Those who enjoy films like THE YOUNG GRADUATES (1971) and THE YOUNG CYCLE GIRLS (1978) would probably like this one, too.